Malicious PDF — malware analysis report

Static analysis result for SHA-256 718c498c8d6f478a…

MALICIOUS

PDF

69.9 KB Created: 2020-12-27 04:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 925b4a74f57ee4eaca8ab9cfe38ab7ae SHA-1: 2009fccd93a42be1195f2476669d863e380335d1 SHA-256: 718c498c8d6f478a4a0e63202846b3b3db386458b3d75592f2272d12ba5cfb25
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming, specifically pointing to 'traffmen.ru' as a redirector. The ML classifier strongly flagged this PDF, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were extracted, the embedded links and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/wb?keyword=web%20tycoon%20simulator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f9ff339117c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424692/normal_5fc5274092d75.pdfIn PDF document text
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/zezevini.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/7747857.pdfIn PDF document text
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/4789b770ae1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/athetoid_or_choreiform_movements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b63491-a18c-4828-a522-b65283c13a5e/vavifabu.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/87521446524.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/calculus_volume_2_narayanan.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/kruskal_wallis_test_example.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/taxanurokeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9d8fcf-49bc-4765-99d2-5153f60db8e9/blockman_multiplayer_minecraft_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/biology_chapter_12_answers.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5200 bytes
SHA-256: e8e7741bc42fb64df5d54c0154b1e51b7d7a6569954134affe89bd8f93d742cc
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10884 bytes
SHA-256: abc97d6a89c48fe44fbed14e465014e87a35bf9577e078df7d7f7941431f1a86

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