Malicious PDF — malware analysis report

Static analysis result for SHA-256 34661d712affd9d1…

MALICIOUS

PDF

38.1 KB Created: 2020-08-29 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49174c4922d370689d424ab23290b4e SHA-1: 696eea419c8522d588f7d872aa77e723415d75c2 SHA-256: 34661d712affd9d17f4250d7da8b2ae05ede533e4a6288fd4d61cb3ff35b7fae
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised with a Google Music Manager keyword. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector indicates a likely attempt to deliver a second-stage payload.

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=google+music+manager
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca6ca4fdd294ad1afac36aad4b7c27e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ba8fa64ff2146f39c01d83a7ed68bbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2f482353dc9401d8619a086b667ae32.pdf
    • https://static.usrfiles.com/ugd/9cc572_c2f0c58e828c419cad5ff6b984d9988f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2baf3123d5914fa188f56659c9d14a21.pdf
    • https://static.usrfiles.com/ugd/b8c837_247cd209853c4a25a96d0aec6944b7fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_57315f2387064f5b9116b351a20719dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62cfd464b1a416fb85931d185a71ad7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fa672193f8f495ba5c5a35fbf6b7472.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/38331699891.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/wrapper_class_in_java.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_off00005857.bin
50015fac2eddc588114198402b82a84a40425e7ba4880ca1031174e9952e6ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5857 5148 bytes
font_01_sfnt_off000069cb.bin
b937cbeb5dc192a047ee33c849d2dcaa85849de3d333f0a13b0389800adf041b
pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 9948 bytes