Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3f5c8549fe2f21…

MALICIOUS

PDF

41.6 KB Created: 2020-08-04 15:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a032dfed4fcae68375b21f53789801b SHA-1: 8607cd298bab431862ae2a79b3aa58deb8421703 SHA-256: 5e3f5c8549fe2f21aee286e675a44a208557ecaa2481bb5b94081c47707b3d24
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is a strong indicator of malicious intent. The document also features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The presence of a password-protected archive lure heuristic indicates the document is likely a dropper or part of a multi-stage attack, aiming to conceal a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=avitaminosis+en+aves+pdf
    • http://files.shoplevena.com/uploads/1/3/0/7/130739614/1072577.pdf
    • http://galobidi.jacobsladderbrookside.com/uploads/1/3/0/9/130969356/riwonajadoxavig.pdf
    • http://files.gabriellefreiretherapy.com/uploads/1/3/1/4/131438216/1d132aa8a29fb0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/21035982354.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/32761348550.pdf
    • https://cdn.shopify.com/s/files/1/0436/2105/6672/files/63641817229.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/leroi_compressor_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/xivilotigedu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/guvofaxofizugekeriwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7264/files/pejefav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/dujidusekaginasiguja.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/10163966237.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2254/files/71676863813.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/sakute.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_off0000643f.bin
605cdf688aca237f43fa05e9108f10de94a639ad2e5f416aedc1d23aeec7af66
pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 5108 bytes
font_01_sfnt_off000075a0.bin
a1940ddac98a4ea9c88100abad5f45d30bed7f57b6a165dcdf1ad8d66842aa38
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A0 11096 bytes