Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f4c1a329fbc286…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 10:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 163326a19af5c5637f2b00eaededbfd7 SHA-1: a071d8a1fb8379d6646d2db0a8220d2507b66066 SHA-256: 75f4c1a329fbc28675da1875353408e14303243f711d4cab3bd400ea9ecd6244
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text that appears to be a lure for a "precision trolling download". The presence of numerous links to external PDFs, many of which are benign, indicates a potential link farm or SEO manipulation tactic to distribute the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.cc/wix?keyword=precision+trolling+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_c3c2376ae67d464898afebcb1a36d0ab.pdf
    • https://static.usrfiles.com/ugd/432b07_b16d7a87696546fab78bf1ab7dca16c2.pdf
    • https://static.usrfiles.com/ugd/6c98bc_56bbecf0ebfb406083a0eefd7458821c.pdf
    • https://static.usrfiles.com/ugd/aef5b7_dbbeb9d8eeeb4470aec1fc7bfd19a176.pdf
    • https://static.usrfiles.com/ugd/353d00_4f45fec0b286410f928012da32eb8953.pdf
    • https://static.usrfiles.com/ugd/b88e3d_23e523c00df14d78b884ac7567028d6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_25fba612dc2e47c586cf84a4796c1e66.pdf
    • https://static.usrfiles.com/ugd/97634b_d9f8edead9974591917f01de5d21545e.pdf
    • https://static.usrfiles.com/ugd/87a178_8daa41a5a7c542d983d75fd0945adf7d.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4162/files/xbox_image_browser.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/kefudumukuvovapago.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6adf93ce0f48d98c259360aaceadf6.pdf
    • https://static.usrfiles.com/ugd/ef7b09_2790a963120b496c91f93483a73d3aea.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2298079133140999817f0eb7840f75a.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_off00006229.bin
f0fc809948be9d6341fbb6e0bde16a95c3bb19eeab6b5915496171622f133586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5200 bytes
font_01_sfnt_off000073ee.bin
c2d5a8e853b66e25ed0a127bc4cbeda4fd9c2e38d6e990a56aa998dfd273a115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 10684 bytes

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