Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf457a5cc9444b0…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 18:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c302b1322b2e1f22c1c98d3d4ebaf3e SHA-1: 15bf66eb2964f2241864bef012ca65347f417510 SHA-256: 0cf457a5cc9444b0428b5caa2a3fe8f2d40927dec1bf50a2c6f8e505a8840776
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, https://ttraff.ru/wix?keyword=attestation+rt+2012+gratuit, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector points to a phishing or malware distribution attempt.

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.ru/wix?keyword=attestation+rt+2012+gratuit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_aaa127cd327a4c31bba8db0789d08c23.pdf
    • https://static.usrfiles.com/ugd/b77b08_ab7ebdcecceb43a4af043c8f4fc7d03a.pdf
    • https://static.usrfiles.com/ugd/2c608b_e6f59486758a4c92b4cdeb8c5f7a9e09.pdf
    • https://static.usrfiles.com/ugd/b8c837_baf03b0f78af4595a2ef86900b87d4ac.pdf
    • https://static.usrfiles.com/ugd/15cd4d_ff785025ba0549d9b80a2ceb342deedb.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/washington_post_march.pdf
    • https://cdn.shopify.com/s/files/1/0430/9126/3649/files/ending_consonant_blends.pdf
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/31928242148.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cb417fc5a44158927dfaadcf54042e.pdf
    • https://static.usrfiles.com/ugd/6116da_613c23d0633e4904a9ce287ff5d060a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a45e1b3dd2fe47818ec4a5f164506978.pdf
    • https://static.usrfiles.com/ugd/b8c837_448da653320e434d9652c41205afd22a.pdf
    • https://cdn.shopify.com/s/files/1/0428/5598/9404/files/american_movies_free_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0465/1125/9798/files/vularekinibuvupano.pdf
    • https://cdn.shopify.com/s/files/1/0433/3499/2025/files/3527416176.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_off0000647d.bin
76dc2481a922bf0896ae6380ff5ccfe0d13308030809dc7ed7cc425672e247fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 5136 bytes
font_01_sfnt_off000075ff.bin
aab623cc46222da7fe5a1f67f132a1788dc017c8c2c0d892e736a4503b451bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 13784 bytes