Malicious PDF — malware analysis report

Static analysis result for SHA-256 169c591c5269441f…

MALICIOUS

PDF

47.9 KB Created: 2020-08-20 10:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9da503cac88d4f0d4945b89b141e566 SHA-1: 57f72dce2c326b0abc904528fbbe768bc47ec023 SHA-256: 169c591c5269441fbba8e4d1399f2d3b9df66ca6603d4924faeeb49e83a2154b
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=kubernetes+api+cheat+sheet'. The presence of numerous external PDF links, many of which are benign Shopify links, suggests a link farm tactic. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely as part of a phishing or malware distribution scheme.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kubernetes+api+cheat+sheet
    • http://vasal.nomnomgelato.com/uploads/1/3/0/7/130775274/6773119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/algae_classification.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/wavekatubogilutitiva.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/lowojit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/administrative_management_approach.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/11902197620.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/xanathar_s_guide_to_everything_new_races.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6706/files/lonexefuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9738/files/algorithms_illuminated_roughgarden.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_off00007110.bin
834b05ee6f4d011851c4e6ca78e4456fba66fddd977388baff4f7794c2274d40
pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 5096 bytes
font_01_sfnt_off00008259.bin
ed3006b49189f91e7418c972313ffed97bdfce1d5cf9f89f7d308b3026b9b1b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8259 15732 bytes