Malicious PDF — malware analysis report

Static analysis result for SHA-256 8907d719123dc729…

MALICIOUS

PDF

48.0 KB Created: 2020-08-17 02:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cffde341d3c0e95694f96dd176550664 SHA-1: d7ead7998bd590c3e0a2b6fe1e68bc0b9d3eddb9 SHA-256: 8907d719123dc729d4196ca809f0f97d2e70f0cc98b32a224bcec6283137d575
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links. A critical heuristic firing indicates that these links point to a redirector service, specifically 'ttraff.cc', which is known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=hip+adductor+stretch+pdf', suggesting a lure to disguise the malicious redirection. The presence of a large link farm further supports the malicious intent.

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=hip+adductor+stretch+pdf
    • http://files.shearwondersboutique.com/uploads/1/3/2/6/132681479/jotaze-zujogutu-tejoriwe-najatoj.pdf
    • http://files.albertcuypclinic.com/uploads/1/3/1/3/131383493/40ed542c19f.pdf
    • http://files.heathernormansmith.com/uploads/1/3/0/7/130775245/8687857.pdf
    • http://lidunuv.testirishracehorseowners.com/uploads/1/3/1/4/131406427/1368909.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/23938581199.pdf
    • https://cdn.shopify.com/s/files/1/0434/1563/4071/files/towaroveb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7236/4437/files/31422592589.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/10469209110.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/makesojawafaxageriroba.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6663/files/fedaditalikazil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/15875375776.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/dirufom.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/begf_101_question_paper_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/problem_solving_creative_thinking_and_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/dexetigeraga.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007222.bin
a75d4de7f7f9dd6ff6aaf9bdd950862f5f59970d57ee92618825fed0bc0471f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 4948 bytes
font_01_sfnt_off000082fd.bin
f3bc614b244712b41fd5470d4aae806d8e2f33c3e111a696b83bc4c2292503bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FD 9860 bytes
font_02_sfnt_off0000a4b2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B2 4324 bytes

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