Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d2babd68d65a2c…

MALICIOUS

PDF

46.4 KB Created: 2020-09-06 19:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 101fc06af31ece7655031fb8ee2244f4 SHA-1: a89d49160a058ece1903f27de7ce4f6bd04c5d57 SHA-256: 44d2babd68d65a2c7d554555343b9093c5b801f81a6c064d2feb748798599c07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a link farm, specifically `https://ttraff.ru/wix?keyword=caracteristicas+biopsicosociales+del+adulto+mayor+pdf`. This heuristic, combined with the ML classifier's high confidence, indicates a malicious redirector. The document's structure suggests it was generated by `wkhtmltopdf`, and it contains numerous links to Shopify-hosted PDFs, likely part of a SEO link farm strategy to distribute malicious content.

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/wix?keyword=caracteristicas+biopsicosociales+del+adulto+mayor+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/83276978637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/day_of_the_dead_pumpkin_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/bollywood_emotional_songs_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/damojezijenepibogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/84901879010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/5690513625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/98483395258.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/aix_command_reference.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/68748681585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/alfabeto_braille_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/40988738968.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e9cba9_1df5f291846245149c5619476e0b8f43.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b80405_289a5343f36b4294bba0ef154907c552.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a474dd_e1159604b2864b18adae7ec25ab8844a.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_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 5340 bytes
SHA-256: fea28bc156bdc7cdfe16e3c51930ecfad04f0d5d236d266f09a9093a7df421de
font_01_sfnt_off000076d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 11576 bytes
SHA-256: d1b6633d679bf050750dfac944e9e4eb94b809b38de3efb7cae28f81e179f63a
font_02_sfnt_off00009c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C62 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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