Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea2b85cbea3ae08…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 16:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ed6ee72f35d6b77bd382ac891c97b8 SHA-1: 09637f471f7cb5ac95592404cef8d5f678a06a45 SHA-256: 5ea2b85cbea3ae082d35b413413ea13ee8f49b852de7fde1472918223a0d9cbf
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=most+unanswered+questions+funny. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an attempt to deliver a malicious payload or phish for information, aligning with spearphishing tactics.

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.ru/pify?keyword=most+unanswered+questions+funny
    • http://files.marrickme.com/uploads/1/3/1/3/131398432/b56fb000f3abd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/xujolikezopusarafibukugej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/6333497151.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/petovutonenazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/manejo_asfixia_perinatal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/88228139644.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/99895401282.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/whatsapp_for_laptop_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/autoestima_libro.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/sutodolosegazemasofo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e8.bin
3bd0f6c25c5b21f2bb8086fcc2e60ebcca1ceda7663e251c6839a92aa20e3965
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E8 5196 bytes
font_01_sfnt_off000072c0.bin
3b159bc2d877ea5df18cfc5fd4c16eb303fb7264e0ecd792604f54c45ed2990d
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C0 10904 bytes