Malicious PDF — malware analysis report

Static analysis result for SHA-256 e282bc0a157e54b8…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 10:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 900022fb7cfc03705cd7d33db9929547 SHA-1: 10fd0fb050c90c81c428c63c0285d2c1ac9768dd SHA-256: e282bc0a157e54b8fac2264e991252b7f1285d55a78de01249e20a935966fefe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/123?keyword=view+chegg+answers+free+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f99efc151216.pdfIn PDF document text
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/6886362.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/zugisu_joxupijosog_tukexexa.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/gavefatoxofideza.pdfIn PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/buviferur.pdfIn PDF document text
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/pinodami_muloxoniliba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d0472b-2823-4e78-9f75-f4ba8f160c29/tillie_and_the_wall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e15b38-c44d-4608-bad8-786f79eb7292/66141763914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f7e910-3f20-4605-bdee-e30097d1f66b/59561353776.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_off000065d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D6 3396 bytes
SHA-256: 019ae317c1ae45cf80e7afb453b05714fcc380a874e5f543d71113ea1553695c
font_01_sfnt_off000071fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 5308 bytes
SHA-256: 427c16353348b5350ec1f92209d6c6123638470c0e0ad335a56fc7652178c470
font_02_sfnt_off0000841b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841B 10452 bytes
SHA-256: 8902b9cc88ce0ff05ecac322f84d83ad613a2d9d420e3565b661ee12f2352d55