Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cd84f76a3dbaae…

MALICIOUS

PDF

37.0 KB Created: 2020-08-16 22:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1feb656702530fe76f411a63d51714f7 SHA-1: 5e53307707e15d520a45e9c642ac611ba1122cfd SHA-256: 40cd84f76a3dbaaea4116bb12ef37ec69361208e34c1e44e96c7725dcee1dbde
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic identifying a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=java+format+online, which is likely used to direct users to malicious content or phishing pages. The document body is heavily obfuscated, but the presence of numerous links, including those hosted on Shopify, suggests a link farm or a deceptive content delivery mechanism. No scripts were extracted from this sample.

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.cc/pify?keyword=java+format+online
    • http://files.strongholdinteriors.com/uploads/1/3/1/6/131606968/tugadu-xileroja.pdf
    • http://files.ibelievewoody.com/uploads/1/3/0/9/130969887/8635393.pdf
    • http://juxodom.designcycle.co/uploads/1/3/2/7/132712615/gugikudevevoxomak.pdf
    • http://files.westoneheatingandair.com/uploads/1/3/2/6/132681783/6613421.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/pukidamikixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/tunefan.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/85547897976.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/19237258715.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/xodexu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/priority_queue_algorithm_in_data_structure.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/95426232466.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/goluve.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/wefax.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c8.bin
39eb3f6a26c89772b735cd1f2c98ffbcd9377ee84e853edca46eba00efef181c
pdf-font-stream PDF embedded font (sfnt) at offset 0x51C8 4784 bytes
font_01_sfnt_off000061fd.bin
a37e731ea252d561a4a345ef4bb3de2992e7f7a604a5a61827917e89ee3c96fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 11036 bytes