Malicious PDF — malware analysis report

Static analysis result for SHA-256 031e0684a6b51978…

MALICIOUS

PDF

44.0 KB Created: 2020-09-10 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b1c54a47be710a68d920920d8f824e SHA-1: ef60efbcf0b62d6f0dd4979c92b24620ade2e358 SHA-256: 031e0684a6b51978a7cbcf91ebce4c9e5eb16a2a11ff965779c80ccfbedd166a
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or redirection scheme. While no scripts were extracted, the presence of a malicious redirector and numerous external links points to an attempt to lure users to potentially harmful 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.link/pify?keyword=06+mustang+gt+auto+to+manual+swap
    • http://lemevi.freebackgroundphotos.com/uploads/1/3/1/4/131407668/820924.pdf
    • http://wafirevot.fiveboroughbucketlist.com/uploads/1/3/2/8/132814742/1376973.pdf
    • http://fuzobufes.timsteigenga.com/uploads/1/3/1/3/131398455/7591684.pdf
    • http://files.rcgswi.org/uploads/1/3/0/7/130738534/ddbd02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_09965cc0bac748d0a6ba1edf743a910a.pdf
    • https://static.usrfiles.com/ugd/4bb894_0397f7a8ff944580b65f09cb4005e16d.pdf
    • https://static.usrfiles.com/ugd/aff7ca_6c2db8709a55419391322ed9ab4b083c.pdf
    • https://static.usrfiles.com/ugd/d1c05f_8af45caacbf144278b1dcaf3dc126f20.pdf
    • https://static.usrfiles.com/ugd/76aeb6_b272e88c09a34320a8b00485429095cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b108d09a0114a81aec1da4e4a13d027.pdf
    • https://static.usrfiles.com/ugd/22739b_6652fb0253a044b08217aed4bd0afeab.pdf
    • https://static.usrfiles.com/ugd/01d500_9f5f1239bcca4d7585a3f23a2c87d9a5.pdf
    • https://static.usrfiles.com/ugd/d31907_0606a13705bc46999a995a872a32a453.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_off00006cf3.bin
64d7287944cb5f184548895c68ce3ae9a0b2d66b0830813cd4ea1f4f92ccf3cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF3 5336 bytes
font_01_sfnt_off00007f20.bin
fb3fa2791d017f818dc605920ddca0ad15bae19eab1a50bce83cdbe72b00be78
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F20 10504 bytes