Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a851c56500dbaf4…

MALICIOUS

PDF

56.7 KB Created: 2020-08-07 15:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c18d07c612e522e933027a3e8702ef SHA-1: 87f4ceada91509534f6ffa7057df84923175bab7 SHA-256: 6a851c56500dbaf4c273666d5700a226d3e2291c99c33a5ee459068637c1e07b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector infrastructure, indicating a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.com/pify?keyword=biozone+ap+environmental+science+pdf, which is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains embedded URLs consistent with this malicious activity.

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.com/pify?keyword=biozone+ap+environmental+science+pdf
    • http://files.mgdesigns1.us/uploads/1/3/0/7/130738912/1739539.pdf
    • http://files.ubaentertainment.com/uploads/1/3/1/3/131398129/toroza_zoxawuxofosanur.pdf
    • http://files.fil-amchamberofcommerceofsacramento.com/uploads/1/3/1/3/131379049/misexarosololopaxaza.pdf
    • http://files.lieberconsulting.com/uploads/1/3/0/9/130969306/bitafaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/formal_business_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/public_sntp_servers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/kaxotukuwibifonarorep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/8039627827.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/40278617651.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/futomavaguwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/electronic_signature_software_for.pdf
    • https://cdn.shopify.com/s/files/1/0437/8833/7303/files/wudubedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/88911579428.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/loan_agreement_and_promissory_note.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_off00009d6a.bin
97b18bed85c381135263c17eba22fff4dd7c1e5a2d64a91bf8605282ca298c83
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6A 5460 bytes
font_01_sfnt_off0000affc.bin
765acd1bc2b30f58a0ecc4a89e121b59b1a3893832504ada5e7b565b87b2e950
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 10620 bytes