Malicious PDF — malware analysis report

Static analysis result for SHA-256 78519bad21a0d13d…

MALICIOUS

PDF

35.3 KB Created: 2020-08-31 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f2769224b95c7790157a67cd4b290b SHA-1: 2047bdacc2ff6c0894c6cdd429325868efdeb45e SHA-256: 78519bad21a0d13d463d6d85e69fae8bb4a8d1f224957fecb5da0d0a158724ac
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=sector+yacht+timer', which is likely the primary malicious payload delivery mechanism. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt to mask the malicious redirector.

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=sector+yacht+timer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9899/5877/files/51959998665.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/kanemunewasogifidelotogal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/52769605709.pdf
    • https://cdn.shopify.com/s/files/1/0438/8601/8712/files/bently_nevada_3500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/6690/8834/files/84675266977.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/examples_of_academic_strengths.pdf
    • https://cdn.shopify.com/s/files/1/0430/9352/4634/files/amantele_trecutului_volumul_1.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/whatsapp_plus_7._35.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_50136f8a66a645c9ba9fe9f0fc2fe7d4.pdf
    • https://static.usrfiles.com/ugd/a107db_2a12d69608b045389807ef9b75c01b42.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f17923b4a0d416fbc5000765ac83152.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/apcoa_parking_appeal_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/0322/2944/files/jatowufawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.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_off00004d3b.bin
4f522782d54fad3018edc0329a7719607cc12550133140b33490a8dd2d081816
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3B 5036 bytes
font_01_sfnt_off00005e35.bin
f7a02e5405e1063e81d8a1dce20257d0236dc53e5b25cee55c69b53d5e36ec33
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E35 10040 bytes