Malicious PDF — malware analysis report

Static analysis result for SHA-256 e227194ddea24323…

MALICIOUS

PDF

84.5 KB Created: 2021-01-05 21:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3ba3a7ed7fb0fc88b18099e7df7a73d4 SHA-1: 89e5e8354a84c959f88611d37ccccb7c2b4edd86 SHA-256: e227194ddea24323c9742f84fbed4bcaf6b53ac01696a67c057674c543ff6b39
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or phishing lure. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=activity+indicator+android+github'. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and link distribution strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=activity+indicator+android+github In PDF document text
    • https://witorovi.weebly.com/uploads/1/3/4/6/134643219/38ea5f6ee678f7.pdfIn PDF document text
    • https://sotufipepu.weebly.com/uploads/1/3/4/5/134595957/bojexezakoxon.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/8ul7jfr/16651093645.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/benekavuzamas.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/gojedevubonoz-kepoxak-gebufejiduna-wezagiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8fa2be03d51.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/tidemom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ff16e7eaa842.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/tolilefopesuxijekixa.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/3778895.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/f6fa0ee00df4.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/8bdae5bd-0a9a-4c5b-bec0-2512ff451560/37347652522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852da283-e8f0-49e8-9229-c880048e05fb/fadapimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36d7954-0ae8-44bb-bacb-68c5ffbec533/zorezitomesef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 14300 bytes
SHA-256: 034efc7e7bdfc571299e78c7098314746c12ffe659515f804fc25c48387dd35d
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 5280 bytes
SHA-256: eb0bbbcd1bbc4f2779e744d36b0940fe878de01fdd2ccce0b4d944c11fec396d
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 11516 bytes
SHA-256: 4e923015a0e79075280569ed666cec42399c9f8fb6b59c352fd94b92512e8809

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