Malicious PDF — malware analysis report

Static analysis result for SHA-256 805724e3eb165968…

MALICIOUS

PDF

46.7 KB Created: 2020-08-07 07:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c819dfb0d2f8933bdf5ac473bd06e676 SHA-1: 789e78da8fca67bb33b31bcf3874fa2025e1db27 SHA-256: 805724e3eb1659688054b3d6f97a098ba5d4ae8d4c31931445bd0a13bd0708c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=oxford+dictionary+pdf+version'. The document body, though heavily obfuscated, contains text related to 'Oxford dictionary pdf version' and the authoring application, suggesting a lure to disguise malicious intent. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning or to distribute further malicious content.

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=oxford+dictionary+pdf+version
    • http://files.photostars.ca/uploads/1/3/1/4/131407968/74607ffdddd2ec0.pdf
    • http://files.smartersweat.com/uploads/1/3/1/3/131379183/fujoxojogo.pdf
    • http://files.iuaonly.com/uploads/1/3/0/7/130738711/2394453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/susuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/ayat_ruqyah_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/55509104377.pdf
    • https://cdn.shopify.com/s/files/1/0429/0700/9180/files/84474607088.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/xelukeboduwaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/xegubizabefovuvemulas.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/bonjour_tristesse_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/39122085457.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/45225939270.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/linaxuxeziwimadujidojavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/xobojokimijukebatuwopikor.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006033.bin
ce969a3c9c2a33d5a3d3c321edd61217335a41479c7f62f9aebdb23b75877a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6033 5376 bytes
font_01_sfnt_off0000729b.bin
5e7629366882a674b28a9ca37949705b50b8b98524086f1006596f665c0139e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729B 10624 bytes
font_02_sfnt_off00009717.bin
4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9717 16544 bytes

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