Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ef3841695b4e4…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 14:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c574a5c5c636bef6c37982279e0cc6d SHA-1: cf5efadedf9609d5a404746273b87d53a46d751b SHA-256: c75ef3841695b4e4c2b28c68d7d3ef1514e2565414fc05db89bd721e93594be9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=free+project+management+software+downloads'. Another critical heuristic noted a PDF link farm with many external links, suggesting a potential SEO poisoning or phishing attempt. The document body contains garbled text but also includes the same malicious URL and several benign-looking URLs hosted on static.usrfiles.com and cdn.shopify.com.

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/wix?keyword=free+project+management+software+downloads
    • https://static.usrfiles.com/ugd/b8c837_6d1d4311fb914efbb28328a453795686.pdf
    • https://static.usrfiles.com/ugd/b8c837_84847834873444aebc223872457b6ca6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d929c766944c415f87fd7ebc8aeece3e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1959/files/12560267222.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/jaligelivumugab.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/begenomavefiset.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/ruxok.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd43c14f88954335ae0f6564ca109218.pdf
    • https://static.usrfiles.com/ugd/b8c837_486f1f31eea14163a8fc8d6835a42799.pdf
    • https://static.usrfiles.com/ugd/b8c837_026f840908d74eab9d7d60ded1dfcd08.pdf
    • https://static.usrfiles.com/ugd/b8c837_102fd65e56ab4c76b67f2895b60e47d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb0b068f3bd44d729797f132ed3b1342.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e2d0362b9c4402db62c9296864173e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c54c3390944eca86eb5a47c4154b3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_059c75bd1f784c759520fbf3d2df20cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1854796f68aa48ba8ef2d54570f67e0b.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_off00006432.bin
80425128620d08e54e0775b62f570543596dda0a607471c1c6cfcbdbc8fc383e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 5600 bytes
font_01_sfnt_off00007738.bin
23dbe9e4c24d25a2d42a5d1d76639a5bce181d7b5ad156f0b1b9c67834cd3bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7738 10096 bytes

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