Malicious PDF — malware analysis report

Static analysis result for SHA-256 763af09bc2810e68…

MALICIOUS

PDF

36.9 KB Created: 2020-08-18 19:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b2374d2f11de57d098dcfe47030a91 SHA-1: a892b5061dc0fa614ae479bb3d58f53cd32f6b03 SHA-256: 763af09bc2810e6858e2aec1ddc668cf9c7c43ac8e6c23f4069495d2f087834c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=baradene+application+form', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous links pointing to external PDFs, suggesting an attempt to distribute or host malicious content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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=baradene+application+form
    • http://files.boldexpressionsco.com/uploads/1/3/1/8/131856212/6096374.pdf
    • http://files.merivaki.com/uploads/1/3/1/3/131379718/1688770.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/89570883125.pdf
    • https://cdn.shopify.com/s/files/1/0431/7075/8820/files/lutegagawama.pdf
    • https://cdn.shopify.com/s/files/1/0433/7700/0611/files/aprender_italiano_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/sepigivikake.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/34118783458.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/xibogujirewuwapera.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/gastrocnemius_flap.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/warhammer_40k_space_wolves_codex.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/tisofarilamofenuwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/12033395307.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_off00005478.bin
c700d585a397f4c1a34b8e2b5b1085b8c5301129a81b687a57b1dc317215297d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5478 5172 bytes
font_01_sfnt_off000065f1.bin
20e31d9add70fe3a1b730f6b09664b0f34a0296d5071e671d04f21c9f8391a44
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 9712 bytes