Malicious PDF — malware analysis report

Static analysis result for SHA-256 6407f0b94fc66879…

MALICIOUS

PDF

78.4 KB Created: 2020-12-17 18:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aec462c4f637e8590357a0e732154219 SHA-1: e725c1f83fb9152732c4357051aef5ab38c9b8d1 SHA-256: 6407f0b94fc6687913a7c599f496bd9d9ecf1467417812b07f06ffb3033ecf92
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, and one specific URL is identified as a redirector for a 'free-download phishing' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interest in game mods to redirect them to malicious 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=8+ball+pool+mod+apk+4.0.0+unlimited+money PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5f94ef1ea1973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fc7618f3bb0f.pdfIn PDF document text
    • https://zivexipoter.weebly.com/uploads/1/3/1/4/131483036/zarizosemeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fce4e20d1962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f9bc4728a643.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/tisawaligulifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f91facfacc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fd65c85d912e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_5fb7168464a19.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/11a54c8d-fe8e-4a52-971c-f5c8a96fc3c8/wow_tbc_engineering_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc138f9b-5f44-443d-b753-6998d5d19ca5/56084470909.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/computational_complexity_modern_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/like_the_sun_short_story.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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 5496 bytes
SHA-256: 00d2343e46237e5d2a187162c716cf84b322aca247867e113ee0277e14780d3b
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 11044 bytes
SHA-256: 839fd939bd2fc3f7bde00dc59e9b08d305334b776a5a97b7045949a76bb2fc8d

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