Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce4ca73e725590c…

MALICIOUS

PDF

50.8 KB Created: 2020-08-30 12:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5df8967669bd9073096a09fb1bb9872 SHA-1: 6f60ebd4e26cd4dc03bf7c49015866f9254885f9 SHA-256: cce4ca73e725590cc30f4fe73d6d2a047fe03afedc5506cd045e0b345c8b1673
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.ru/wix?keyword=nmap+network+scanning'. Another critical heuristic identified a PDF link farm, with the first URL pointing to 'https://static.usrfiles.com/ugd/b8c837_e932bb83e56f44c2acd3c97be955dd67.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to Nmap network scanning, likely as a lure.

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=nmap+network+scanning
    • https://static.usrfiles.com/ugd/b8c837_e932bb83e56f44c2acd3c97be955dd67.pdf
    • https://static.usrfiles.com/ugd/b8c837_c745da03750044f99e6ccb6407b391d2.pdf
    • https://static.usrfiles.com/ugd/ac51ce_d75620fd215a4dca803e962109fb1543.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/69472986534.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/fufitutur.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/vevoxalifawasutumufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/74766769349.pdf
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/oxford_english_for_cambridge_primary_6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f6d74d10bc47bdb90ccbb503061549.pdf
    • https://static.usrfiles.com/ugd/b8c837_37c0672c55984546a209a1b2c222cf94.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea840c07449841309ba662df1533cf19.pdf
    • https://static.usrfiles.com/ugd/a76634_0851b6ccd698420384be79a348f8a9dc.pdf
    • https://static.usrfiles.com/ugd/e6092c_89341ca841ae4cdd85b236cdb28758b5.pdf
    • https://static.usrfiles.com/ugd/d54300_4983431d410a4d7e8fc5368357a2c9c6.pdf
    • https://static.usrfiles.com/ugd/565485_bde634e7790e47ba846c1a5c9334e14b.pdf
    • https://static.usrfiles.com/ugd/b8c837_04d9a5dc6c114c009b489c546dfeb623.pdf
    • https://static.usrfiles.com/ugd/b8c837_96b525a2971e46f187e573606558a986.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_off0000879f.bin
1ff4ce4edd9087b46f863b4f25f8d5b19d088f5764ae88c15978b1fff23eef45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879F 5344 bytes
font_01_sfnt_off000099d3.bin
1e0f3024285831f751aa8b1ceac134972bece870cddafdf78bb4e1fbf9cc7fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D3 10696 bytes

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