Malicious PDF — malware analysis report

Static analysis result for SHA-256 073dd9c8f01d469f…

MALICIOUS

PDF

49.4 KB Created: 2020-08-09 17:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86da3697fc4b2bddfbbb4d44b963187d SHA-1: 816556f3383e9f8e1d307ca3f0edd3be2524583b SHA-256: 073dd9c8f01d469f68fd503fb1ecaef9e13fcd501388115a7f87a3113332e5e3
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into clicking it, likely for SEO spam or phishing purposes.

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=centrales+termoel%25C3%25A9ctricas+de+biomasa+libro+completo+pdf
    • http://files.theautosalons.com/uploads/1/3/0/7/130775997/433874d5f4ec817.pdf
    • http://files.princetonmeadow.com/uploads/1/3/0/9/130968961/gujumigajaruj_fozafawevazawan.pdf
    • http://files.brataussies.com/uploads/1/3/1/3/131379894/taronurenowo-furuzixowok.pdf
    • http://files.miaheintzelman.com/uploads/1/3/1/3/131398236/2322189.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/fozubomijezaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3689/3599/files/9398893921.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/judiwadojafale.pdf
    • https://cdn.shopify.com/s/files/1/0445/6284/1759/files/tratamiento_de_aneurisma_abdominal.pdf
    • https://cdn.shopify.com/s/files/1/0449/8921/8984/files/8304779646.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9610/files/how_to_hack_typing_agent.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/piriformis_muscle_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/16323809775.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/15136431752.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/livre_pour_apprendre_l_italien_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/rotiliturorejurilolufativ.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/fiwodofizomoporemepapekog.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_off00007df6.bin
be27e5e60886f3fbb42f12beed4f6c5b2a09abf353dac0138d7b919cf7dc715c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF6 5488 bytes
font_01_sfnt_off00009036.bin
4ffb54f36be6ea59d9110239eaba5593f4a7a818988d4285365d5e2c7a81f356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9036 11504 bytes

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