Malicious PDF — malware analysis report

Static analysis result for SHA-256 6272f502d0d4232d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae9cf55536570bee561bfd9b550ed05c SHA-1: 961bb69d2f48a7a8f56ce6e695509a55485ce78a SHA-256: 6272f502d0d4232d218947c2a083758f9e72e144c2513fef79b8f3b7a567aa6c
154 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 Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=sixth+grade+math+problems+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence.

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=sixth+grade+math+problems+pdf
    • http://files.nabangapikinini.com/uploads/1/3/1/3/131398369/4c9d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/9237/8527/files/plataforma_virtual_calusac.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/zigitapuzegepikarewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0182/9797/files/nofuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/metallica_nothing_else_matters_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/vernalis_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8482/5247/files/cracking_the_freemasons_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/vokobapomumubasewonudok.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/evento_cerebrovascular_isquemico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0464/7446/1352/files/33516069029.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/novokipotenewi.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_off0000656a.bin
ea1f6b03f46a1136c1986131cd663c0bbbb8a8465a43c00f3dd20be674b3048b
pdf-font-stream PDF embedded font (sfnt) at offset 0x656A 5768 bytes
font_01_sfnt_off000078e6.bin
747d3d2cf8464891ea60a7126bcb6ea10a8c3aea7d19755f9a06a74a5c7dad2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E6 10652 bytes