Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b6fd332a0c9f85…

MALICIOUS

PDF

45.9 KB Created: 2020-10-25 18:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 04e4450fa250ecb0f2bc5557e9ffaa49 SHA-1: 9b8db92ecea03c28b622f1e866f910eb802640fa SHA-256: 72b6fd332a0c9f851aa1b3224c07ebd5e503df0e105f1fce8f724ec3d2f9e8f5
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 pointing to disposable hosting and redirector services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/strik?keyword=liang+heng+y+judith+shapiro+hijos+de In PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/fuvogogusagugo_waritep_pomaxusuvav_fepuve.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/7891164.pdfIn PDF document text
    • https://gixawixo.weebly.com/uploads/1/3/4/3/134322292/jaxozezilig.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/1386898.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/9557730.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/8625127.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/vitebuwag.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/1/0495/9859/5221/files/69011629655.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/84851633005.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/78938804205.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/97301700017.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/78852078795.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/67083124765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c674f83-981e-49d5-9562-fdb9fae5be9d/suviguvukibefufiredano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1933aba8-05d0-4866-85c5-be57b2da9937/23394287780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb4f0a6-5832-4ab1-bbef-3bd080269d19/now_you_see_me_gomovies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b60a28-126c-425a-9dbb-74fd05dcdee8/12561970860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1029a8c-0db5-4f13-9368-44b3d660d883/7621946037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d6bd1b-394e-4a8b-bbba-9b2c2ca87e1f/zosofubag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8eea8f8-8ea4-4094-a772-c2d61f11c1f1/98592310188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b200d27-7ab0-49a4-8a1f-546cc604572a/adcom_gfp_750_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e521810f-2d57-40de-97fb-06dacfa05a87/56709156292.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 3808 bytes
SHA-256: 472699c709172eb127948cdfd4cb9dc21495d9f822c802e18773ac343f5cde9a
font_01_sfnt_off00007260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 5308 bytes
SHA-256: 0c24158f307f8065a02335eac767617cad307ba989bb285c6312aa6d6a13b4ad
font_02_sfnt_off00008470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8470 11044 bytes
SHA-256: c964c14b146990781dc468a546976649545c1bd65deb97932132b761f4dc051d