Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edc9da2344f551e…

MALICIOUS

PDF

43.8 KB Created: 2020-09-02 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72af24256b0ccb06b31f7bf7634a5695 SHA-1: 86a54d559b2226d573ed4f57e1d9af53e9ad8963 SHA-256: 5edc9da2344f551ee5488b212cab97ba936eee280cb02928da3b2b7afc0a6e09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one prominent URL identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous other PDF links suggest an attempt to drive traffic to malicious or spam content, potentially for phishing or SEO manipulation. The ML classifier also strongly indicated maliciousness.

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=parametric+modeling+with+autodesk+fusion+360+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/29c71c_5efcbcd99974494cad04f49d754b3303.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd2484c14884def85a5fb0ec61fbfc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_766294f9829343e69533363d1e0b2827.pdf
    • https://static.usrfiles.com/ugd/54bec1_78b130257e004a54a603bc9021d058e8.pdf
    • https://static.usrfiles.com/ugd/41f880_e24095141ce34516abf4a3a9e14313a3.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_f125a96888ad4ff5adc35811f2306ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_50f6211c317440199d0a1933d8024b7f.pdf
    • https://static.usrfiles.com/ugd/599f1c_3d69412659334c0986c35bcc51fb0aca.pdf
    • https://static.usrfiles.com/ugd/b222ea_6aa1e58f68554225b35410ee5e16a6c1.pdf
    • https://static.usrfiles.com/ugd/362633_15bfce5290e54a41a57bfc807183b60d.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_212341d90beb4dc6a0f761ca2a42e6a5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_af7d930716784748b279379e36f6d702.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcb5058c29704033828765542c911985.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7cec49b4fec4cb78eac6eeaf479df11.pdf
    • https://static.usrfiles.com/ugd/1be480_cb04e0b4c1cf456a84db32c0e5383c85.pdf
    • https://static.usrfiles.com/ugd/3bf302_7b505174b4384a5e89b5c44b70b581ec.pdf
    • https://static.usrfiles.com/ugd/590778_4a1d2ac65c1240dc8438b37b0fdefc90.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e8.bin
3544569b6a45fea865671e3f0eb27243cf5859d06e5b64feb04953290ddec807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 6188 bytes
font_01_sfnt_off00007cd6.bin
988b30c8d6617892df712dfab82761fe22d45429376d720f5b720e5258943d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 10308 bytes

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