Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0e11276c43714…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 22:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f76c7194b46ff3725ab9782b52bf8cef SHA-1: 19f139dd5bba7fbcdbd1c4943fa13cc5078f9d51 SHA-256: afc0e11276c4371487127dd8c8373b6c3d1bce735f3fbc8cc07bfb4bc94b1f79
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to "Irda question paper with answer 2015", likely intended to attract users searching for specific content and redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=irda+question+paper+with+answer+2015 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5fadd9c13e241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8a1b647178f.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/rexugiveg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_5fb92b47593a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fb26418199a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f886d366deb6.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5fb275e634100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5fb5d8b564d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_5faa6bfb7f5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_5fa76747b3218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe7b416-5fbf-48bf-9fbb-925391f4f64b/buvufepirijexefig.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 5620 bytes
SHA-256: 5b12b6472dd204d7ece15842f87851c6e21f317658fcf11a66dfa09ef5515c60
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 10228 bytes
SHA-256: 96cd43381aa3f6136eb295218ad109cbf8df09da8ed93983cb2828cf96679110

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