Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61bf46d9e66c223…

MALICIOUS

PDF

70.9 KB Created: 2020-12-20 23:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad8251812c1c84e38d704724988b2fa5 SHA-1: 76f98c930ab291816de650459ccb5e66d2e73565 SHA-256: b61bf46d9e66c2235069f619aec1647ef5646952387b49079fe4ebff5c53f083
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 point to SEO-optimized content farms and redirectors, suggesting a phishing or malware distribution scheme. The primary URL, 'https://traffnew.ru/wb?keyword=bloons%20td%20battles%20hack%20download%20pc', indicates a lure for a game hack, likely a pretext for delivering malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://traffnew.ru/wb?keyword=bloons%20td%20battles%20hack%20download%20pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fd7ce1032b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_5fa90190c9139.pdfIn PDF document text
    • https://rovafuped.weebly.com/uploads/1/3/4/5/134590195/sosepafitu_ledusiwalosoxus_korevazetu_lidaxavuxukuguf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fcea3c09e727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fd2d8740ae12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8b8ed8ef271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fbdfb0bc0281.pdfIn PDF document text
    • https://pudonaneguk.weebly.com/uploads/1/3/4/7/134767047/girixemawur_zileduxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_5fa868a414037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fd2a6e26eb45.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/1209ba65-3cea-47e6-950e-59358e98a6d9/a_challenge_for_the_actor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f957af87-6442-4a9c-9c68-f2f25f066613/area_code_201_location_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b905f-b8ba-46fb-beaa-3617c9c46bc9/pefaxalalixokozopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36359b2-2ff6-46c7-ae7c-b6680f93dd72/poorest_man_in_the_world.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 5412 bytes
SHA-256: 3bacc86a68b2b2e048033e9daf02621b3aa547e58d28303e954a618db5b41b96
font_01_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 10820 bytes
SHA-256: f7b3113a9bfc63afafe30321648462347a5992da56e40f802c8cce7128ed21f6

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