Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50cfd624a42dc81…

MALICIOUS

PDF

68.2 KB Created: 2020-10-25 14:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e3e620adbe37c7539cc734cc21552b77 SHA-1: 4d99eb9e23338d57aa9f8031a60b8040ccb1f4a1 SHA-256: d50cfd624a42dc81ce20c09170b16b62a03925dc23382c46533f4dd6bc224980
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and one of the embedded URLs is known to be a malicious redirector. No scripts were extracted, but the presence of numerous external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/123?keyword=wordpress+codex+espa%25C3%25B1ol+pdf In PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/7633320.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/bagama_xetapuna.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9530cdb10fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f94bdcba3c7a.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/d0e73e.pdfIn PDF document text
    • https://futiwetag.weebly.com/uploads/1/3/4/3/134367494/wogugutobeseri.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/jolevuwelaluje.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zerejitofotug-dugejamin-dudim-ninizupewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8074/0771/files/61414210656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2209/7816/files/2333842562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc83fa9-7629-402d-a922-125fbd045266/dupubitadigakedawubep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c46931-5d01-460f-9ba3-685f22dc1491/buxomokifiliborugos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f810645-8a3f-4106-be3c-9a394f347681/wujonowimogas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4541fc-dfe9-4263-b4fe-58af7103eeae/7255110930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f722c3-e526-45a0-8115-230e39d79518/68596300019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08df00de-ff65-41cf-9ffe-c28f184dcf94/feneluravikejixolix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ec9f78-569d-4c72-9373-6cb83351de35/descargar_coco_la_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4af1f4a-57a1-428c-9929-7c6e832ffa21/lodido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23d6e32-024f-4761-9147-9c09259a1cff/9359911275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e5b177-1f9c-4cff-bde9-2183439b9353/nawukavazeduxem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94CA 3484 bytes
SHA-256: 2444636224f3b9b5ba2ad69136415b3503c13b7d1bbda50c33ffca0d9aed180f
font_01_sfnt_off0000a12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA12E 5444 bytes
SHA-256: 0c099e3ed6cf54d37b58c99c8d66c9b1da8056131dd0b732cb04b2d0a2f020bd
font_02_sfnt_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 5032 bytes
SHA-256: d65353c1e58b8117dba3b6111dc10a97bd845c7ddcedb9792c302b0022a08e3b
font_03_sfnt_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 12064 bytes
SHA-256: 3c3a8dad8e17db2fc47d1a1977f9d6339b7d4af4064edb4017e20987eda240fe
font_04_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16240 bytes
SHA-256: 9bf95ea917256c1b07a4d5defb8122e5439b85853564df20e2a9dae2cbe8f578