Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c6b29b30b66224…

MALICIOUS

PDF

41.5 KB Created: 2020-08-25 12:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810b803f4e0079b6a3e7d40d5b96c59d SHA-1: d907dd736aaa62c8281b23ec7f593516cb5f1534 SHA-256: 70c6b29b30b662242ea2e70fd04e60dc734c65519baa318fbbcae02b630d1fe1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects through ttraff.cc, a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and the malicious redirector URL, indicating an attempt to trick users into downloading content via a malicious link. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=introduction+to+statistical+learning+book+pdf
    • http://files.mattmediainc.com/uploads/1/3/0/8/130813755/wixasolamelutog.pdf
    • http://fadefa.annbharrison.net/uploads/1/3/0/9/130969352/8985494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/ximopituwukuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/81116628846.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/maryland_magisterial_docket_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/kesal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/chava_kadambari_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/neonatal_abdominal_wall_defects.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/lobakinamitin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3135/files/jifenedowasobim.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/biomagnetismo_pares_por_enfermedad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/what_does_tifu_stand_for.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4149/files/29318578767.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_off000063cb.bin
d686e50b9479b9a332df4c4859788bea1e47ef4947fb5ed92ee6d402d1426bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 5464 bytes
font_01_sfnt_off00007669.bin
b8f41a5631e2b673b43ab360fdc13b043f7254cff3c4a7edce95bfe9efacc902
pdf-font-stream PDF embedded font (sfnt) at offset 0x7669 10164 bytes