Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b92ad87a2eec97…

MALICIOUS

PDF

37.7 KB Created: 2020-07-30 11:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d459aafdac1265039d4c71dcbbb6842e SHA-1: 9699ffef4667d6b30fd1da251c7263c7f19528b6 SHA-256: 84b92ad87a2eec9793ea0d3fc35a8c243dc70b49422fdc4ea6fb4c224ac85fa2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a free download for a technical document. This link redirects to a malicious redirector (ttraff.cc), indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to determine the attack pattern.

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=boucher+s+complete+denture+prosthodontics+pdf+free+download
    • http://files.bleusilkart.com/uploads/1/3/0/8/130873828/7f5fdd7c1.pdf
    • http://files.cometair.co.uk/uploads/1/3/2/6/132681033/b8e40fdaa621.pdf
    • http://files.omarturbi.org/uploads/1/3/1/3/131378993/firabarafupi-nurupip-vewak-rolajuxal.pdf
    • http://files.kdasc.org/uploads/1/3/0/8/130874612/getilodasapud-lotoropazopiv.pdf
    • http://files.theahealer.com/uploads/1/3/1/4/131407572/2758637.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/33247569506.pdf
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/36103622841.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/49943496054.pdf
    • https://cdn.shopify.com/s/files/1/0436/7712/2713/files/pojatukexivezupope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/13368843835.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/ranudanakozetoxitiduwinew.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/44234405118.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/xigis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/72527815698.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1032/files/24338822637.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_off000054de.bin
d596cfd7c629f8d8a182a26cbb9f5c5e2743ede84151aafafb63bb7b3359db36
pdf-font-stream PDF embedded font (sfnt) at offset 0x54DE 5420 bytes
font_01_sfnt_off0000672b.bin
b023948445ac801685f7824b497cd2b9c4f76f6bab78124c1acd29e11f4ae975
pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 9452 bytes