Malicious PDF — malware analysis report

Static analysis result for SHA-256 8859b5332fabca30…

MALICIOUS

PDF

59.6 KB Created: 2020-12-22 00:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6a5a0d82b060a12d46ce899263ec8546 SHA-1: e78a315466a247efc0e723457a0b55462161d995 SHA-256: 8859b5332fabca3009e26af7786a7ef26fbecc895d37e87b4cc8e20278fa9e07
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely hosts malicious content. It contains numerous links to external PDFs, many of which point to redirector infrastructure, such as 'https://traffine.ru/strik?utm_term=truck+racing+game+download+uptodown', suggesting a phishing or malware distribution scheme. The document body, though heavily corrupted, contains text related to game downloads, aligning with the lure observed in the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/strik?utm_term=truck+racing+game+download+uptodown In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f956e2261351.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/f1880a9cd23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fc0d75bc639c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_5fbaa0ef627a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_5fbc59d73da66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5fdb7cf70ce1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fd805f339c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8754e992ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fb5d1298c41a.pdfIn PDF document text
    • https://lavigepes.weebly.com/uploads/1/3/4/4/134437347/balogopovufa_dinuvuzilusureb_metusomiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fd358d6757c7.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/6f551785-9fd8-4960-943e-e66f06103fa4/67322547354.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc142aa68612547ed60969d/t/5fc96e8793b4dc627b5527b3/1607036552196/95141649558.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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 5320 bytes
SHA-256: 402c21c4acdce2c617cbc03dfb3a9e59e062615f3bad5ab329f574ee36c2212d
font_01_sfnt_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 9792 bytes
SHA-256: 984a9ffb3f34156243b6132eb6b062763886e06bcfd1d48cc6662d4ab8798e27

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