Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03194b91c1079e1…

MALICIOUS

PDF

67.4 KB Created: 2020-08-14 10:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e255e88434cee68f1b0182d2d86d3d SHA-1: 6e207a2d31778b595ae55e362a3a4ad13ef107a7 SHA-256: c03194b91c1079e1e24d9dfc168c30e0c233b8546dc3932c1a8ba049730aa20f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector at 'https://ttraff.ru/wb?keyword=cauchy%20integral%20formula%20examples%20pdf'. Additionally, it features a large number of external PDF links, suggesting an SEO poisoning or link farm tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a lure designed to redirect users to malicious infrastructure.

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/wb?keyword=cauchy%20integral%20formula%20examples%20pdf
    • http://files.sailingcruisingscotland.com/uploads/1/3/0/7/130740589/zipakebarujukebet.pdf
    • http://files.saraayllon.eu/uploads/1/3/2/6/132682905/6205747.pdf
    • http://files.sambesca.com/uploads/1/3/0/9/130968920/4453791.pdf
    • http://files.fergusonchurch.org/uploads/1/3/2/6/132695194/4c6a7.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/que_son_los_almidones_modificados.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/areopagitica_john_milton_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/tomuvuvibekefavaruni.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/cambridge_english_empower_b2_teacher_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/harry_potter_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/jupenum.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/dajurutogazo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/tupakidinivakubititon.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/zufigosewalorazideku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/41924044932.pdf
    • https://cdn.shopify.com/s/files/1/0447/0043/4586/files/achilles_tendon_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/23848376381.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_off00009e6d.bin
759d52cdd1df8f83467a39cbdf1bf2b34037fae9364a46bd3ad4a4d4e6e2c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6D 5644 bytes
font_01_sfnt_off0000b17e.bin
2f10749fa36725930550161c6e475177e056d28239345127277e4ae338d27d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 17492 bytes
font_02_sfnt_off0000e81b.bin
1412cb0262bba334174b8b34bcec94847a52cda8145c8b3da7407301ba3b3a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 16724 bytes

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