Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26929000a3c10b6…

MALICIOUS

PDF

42.2 KB Created: 2020-09-02 03:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40e1726c8b64f0d842e73ddfdc4b07d SHA-1: 5c3c9364f238fad382241720554caed90b065f8d SHA-256: d26929000a3c10b6466a05ccdf85c05f643c97f8a9165f509f08cea1c30826e8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as a document about breastfeeding. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same lure text and URLs as observed in the heuristics, indicating a social engineering attempt to redirect the user to a malicious site.

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.club/wix?keyword=avantage+de+l%2527+allaitement+maternel+pdf
    • https://static.usrfiles.com/ugd/544c7e_607e2068f8ab4dd19604a9622c4cbcbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b05c253910c4433b5a6a32592893e7e.pdf
    • https://static.usrfiles.com/ugd/e745be_e0fd534fec22475684b9419c6eee59ae.pdf
    • https://static.usrfiles.com/ugd/c068f8_6ef050146b264531873f90b94aa9665f.pdf
    • https://static.usrfiles.com/ugd/7dd30d_66c689dc0fd044a59aeb053794fb8a3e.pdf
    • https://static.usrfiles.com/ugd/516793_8cd2cfcd1d6e45ebac07639852eedfc3.pdf
    • https://static.usrfiles.com/ugd/82e28d_86a412d33bbd4144a1b81e36e0179c80.pdf
    • https://static.usrfiles.com/ugd/b8c837_686d7e1507834feaa6062da4f1634f69.pdf
    • https://cdn.shopify.com/s/files/1/0450/2949/0838/files/hallelujah_cello_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4976/1433/files/5881126702.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/foganepubofinofupufodimam.pdf
    • https://cdn.shopify.com/s/files/1/0438/4030/7362/files/infectonator_survivors_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4512/files/home_care_benchmarking_study.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/gamekogaropopone.pdf
    • https://cdn.shopify.com/s/files/1/0439/7475/4462/files/jusiranoxilunudoku.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_off000064e0.bin
c75e804688bc9d59a9e1c1eb88f909ee6df1e7e013dda112ee509b82df0a5644
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 5268 bytes
font_01_sfnt_off000076c6.bin
f53c81670107c855b4d1d1e3e7e9873fbfd35a016410cb6c783f72d1145e5a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C6 11812 bytes