Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cea3ec611c947a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 18:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fb8949f4bfde053b01d6a86c6fea673 SHA-1: acc560cc129a490d7fe3a772572020796eac1b59 SHA-256: 85cea3ec611c947a33b8c4b24c810f0db11c109cbab107a4145b98c466e73c3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominent link directing to a malicious redirector at 'https://ttraff.ru/wix?keyword=sad+violin+mp3+download+320kbps'. This suggests a phishing or scam attempt, likely delivered as an attachment. The PDF also hosts a large number of external PDF links, many pointing to benign Shopify URLs, indicating a potential link farm or SEO manipulation tactic. No scripts were extracted, but the presence of malicious links is a strong indicator of 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.ru/wix?keyword=sad+violin+mp3+download+320kbps
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0449/8276/3679/files/sixusaremikejonovi.pdf
    • https://cdn.shopify.com/s/files/1/0465/3108/4438/files/74247763636.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/oxford_bookworms_library_stage_2_alice_s_adventures_in_wonderland.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/act_practice_test_64e.pdf
    • https://cdn.shopify.com/s/files/1/0440/6388/3429/files/funaxin.pdf
    • https://static.usrfiles.com/ugd/b8c837_adfb1b6250b140beb8148a32c6d4510e.pdf
    • https://static.usrfiles.com/ugd/3aca14_539e50ba2c2a49ca91e1f6de713b5478.pdf
    • https://static.usrfiles.com/ugd/b8c837_345162eb8cd841059827dcb328f2ac6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.pdf
    • https://static.usrfiles.com/ugd/158fb9_8c3a904b98644216a7c0f9d9820803ca.pdf
    • https://static.usrfiles.com/ugd/33c377_cfc9c7f8f2774a3f897f5cebfa0823b4.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/fivopidirokalolujitoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/zhang_bounded_gaps_between_primes.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000476f.bin
99485c0dc1557eac2a4be17d75314daa7ce0a7ffbdc0522c995a9cf348bcda96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x476F 5496 bytes
font_01_sfnt_off000059f8.bin
6e5e77db1c98bc44d049e053a9abfa8324c1684a5017ec9a449aef1819f30448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F8 13936 bytes
font_02_sfnt_off0000853b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853B 4324 bytes

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