Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0b31b482b843d8…

MALICIOUS

PDF

66.5 KB Created: 2020-08-25 10:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281955fcb9f01cd834d50a099ada9a9b SHA-1: c3e7c1f4b5c42000c4144ea32d894376861b1271 SHA-256: fb0b31b482b843d86653a456047e2013a57935378133a7184a57729df533695d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=assetto+corsa+f1+2004+mod. The document also hosts a large number of other PDF files on Shopify domains, suggesting a link farm or SEO poisoning tactic. The embedded document body text, though heavily corrupted, contains references to the malicious URL and other PDF links, reinforcing 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.com/pify?keyword=assetto+corsa+f1+2004+mod
    • http://files.theresasegal.com/uploads/1/3/1/4/131406412/mesovawipuwipekaxaxa.pdf
    • http://files.southamboyfirstaid.org/uploads/1/3/2/6/132695543/c773bc.pdf
    • http://files.eleanormccormick.co.uk/uploads/1/3/0/8/130813427/berezopadexivi.pdf
    • http://files.manchesterartistsbookfair.com/uploads/1/3/0/7/130775506/wuzakubonukipij_jinitudi.pdf
    • http://files.ridgefieldgirlscouts.org/uploads/1/3/1/0/131070483/runivixudadukawona.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2273/files/38159910048.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/11560526137.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/23380532348.pdf
    • https://cdn.shopify.com/s/files/1/0437/0887/4906/files/xezefetupedomit.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/66804066295.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/budurebeduda.pdf
    • https://cdn.shopify.com/s/files/1/0440/2236/6366/files/junior_football_gloves_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/all_saints_jeans_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/flammarion_astronomie_populaire.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/si_joint_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/44693457433.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0312/files/16249849264.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/12093382514.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/wekisituri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/watexarevowojedetufinoxa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c099.bin
9da175458ab4d1db1a1c7fe262f86f0b8c73caeefac22ac829050839084cad16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 5536 bytes
font_01_sfnt_off0000d35c.bin
918741803b545ffd2e7b4cf462832cb8695b3bf6329722b9e14a12a0d3efcf90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 12316 bytes

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