Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c249e544bf678e0…

MALICIOUS

PDF

32.5 KB Created: 2020-08-05 02:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9203b3f2f4680f9dd4e69706e1b956e SHA-1: 436e632ced607f6cba38b385e51f0a9ec7024478 SHA-256: 5c249e544bf678e0f07919d01fb51fab942947255c4d52ea60e3b7975157803e
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 external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.com/pify?keyword=textbook+of+diagnostic+microbiology+pdf+free, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, likely intended to lure victims into clicking through to malicious content. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=textbook+of+diagnostic+microbiology+pdf+free
    • http://files.joepeatfield.com/uploads/1/3/0/7/130775368/4621944.pdf
    • http://files.atlanticchallengeusa.com/uploads/1/3/1/4/131407364/kololumivomugajuvelu.pdf
    • http://vowuxup.viholisticnutrition.net/uploads/1/3/1/4/131482976/mapofosumom_didulutinafojet.pdf
    • http://files.schreinerarbeitenbuechler.com/uploads/1/3/0/7/130775084/bikozaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/condiciones_para_el_aprendizaje_significativo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/9495547462.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/dofijovenigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4415/0165/files/tesis_sobre_auditoria_interna.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/17598982653.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/vijay_tv_serial_tubetamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/41981973164.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/dubukeka.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/nedibigewowemugilizunidop.pdf
    • https://cdn.shopify.com/s/files/1/0428/8793/8211/files/soguzujukijasugokojuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/31077343133.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/67768810610.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_off00004433.bin
454b228dfbc555361687639e8cc37c54c08c4d11399fb3ab7ad62c048c2d617d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4433 5800 bytes
font_01_sfnt_off000057f0.bin
43034ffeb8446af6448bf92e3d7b92251995c8227898579a6b080831fdf71b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F0 8472 bytes

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