Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b43e692975cc3d…

MALICIOUS

PDF

65.4 KB Created: 2020-08-31 13:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14fe03f60f29805229aa149cdcf32ddd SHA-1: 5ffc598c8d2cddf1fc900d7fb29d9797526cd0a6 SHA-256: a5b43e692975cc3daa72260a8b8650c7715ccf6650a330824015a9b833d198a9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.club/wix?keyword=exercicios+de+propriedades+do+ar+6+ano. While many other URLs point to benign Shopify domains, the presence of the malicious redirector and the ML classifier's high confidence score indicate malicious intent. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious URL within it reinforces the attack pattern.

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=exercicios+de+propriedades+do+ar+6+ano
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/chess_puzzles_mate_in_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/98895927013.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/attestation_sur_l_honneur_divorce.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/57390823800.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/jowiduputejodebisobafusod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/software_quality_assurance_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/javier_zamora_unaccompanied.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/rudram_namakam_chamakam_telugu_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/33812441373.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/pusekidapemubo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2168/files/48734118164.pdf
    • https://static.usrfiles.com/ugd/10b11f_db11125fda1c4e488a7550d1d5547f12.pdf
    • https://static.usrfiles.com/ugd/b8c837_695ba211d7f043d898ec67f7cbd7a68f.pdf
    • https://static.usrfiles.com/ugd/d01287_3ec31b303cea49baa046f8454fc18871.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a18b.bin
fb5cfd085a27e929bc2cdb8e7077822dd01a7bbc7048b4a3189a07b2f25b2737		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA18B 4920 bytes
font_01_sfnt_off0000b23b.bin
28d7c08f729e42248251a50b6f8e6e098dc5352be524bb333bcea3ee3c921007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 19356 bytes
font_02_sfnt_off0000e8cf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 4324 bytes

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