Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1fd1895ca9bb7e…

MALICIOUS

PDF

47.1 KB Created: 2020-08-02 09:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143087eba39dbd78f22cbe1f8aebb4e3 SHA-1: f48b9d32e596037e66f4bec910bc993481416f7c SHA-256: 4d1fd1895ca9bb7e4f4b03361aec60e030c97835c3f9366e0a5e7201eab7859e
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though partially corrupted, contains the text 'Graham crackers nutrition' and the malicious URL, suggesting a lure to a potentially malicious site. The presence of numerous external PDF links further indicates a link farm, likely for SEO manipulation or to host further 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/pify?keyword=graham+crackers+nutrition
    • http://files.brokenwcowboygear.com/uploads/1/3/0/8/130813357/91a628815e.pdf
    • http://files.lyndolkeith.info/uploads/1/3/1/4/131437689/gobokaxokadifiwetog.pdf
    • http://files.viridesscents.com/uploads/1/3/1/3/131398461/7343333.pdf
    • http://files.thesweetfarm.com/uploads/1/3/1/3/131382590/8099358.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/wepijerese.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/76542057407.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/gudotebokezelaxerarife.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0428/5068/0991/files/fall_out_boy_ring_tone.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/mood_message_for_skype.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/93249169517.pdf
    • https://cdn.shopify.com/s/files/1/0436/7548/4313/files/68888571910.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/39566478109.pdf
    • https://cdn.shopify.com/s/files/1/0434/6278/7237/files/85672126943.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/ford_1100_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/21705622898.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/46057682443.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/pride_and_prejudice_study_guide_answers.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_off00006b2f.bin
b99d04f5478376c8c731499a4fc0a1fcbcac4d1c1a89c0f19a6deaf09b0271c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 4984 bytes
font_01_sfnt_off00007bf9.bin
ef1eec56a501043aa923683be925d5fcf23b8b99890312eb6a5b0f35b94b6cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF9 11044 bytes
font_02_sfnt_off0000a19c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19C 4324 bytes

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