Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffdefd9bb35a275…

MALICIOUS

PDF

84.4 KB Created: 2020-12-23 04:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11fb716e695b8f4e262f13b0f63bb9f SHA-1: b93e7460e52711522ec81bb5f85ac90e0375aead SHA-256: 6ffdefd9bb35a2756a57d4290556c018a070944aac4b5b9cf3fd0fc911515135
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains, indicating a link farm designed to lure users to malicious sites. The presence of a link to 'ggtraff.ru' with a 'broncos vs steelers live stream' query suggests a phishing or scam pretext. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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 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://ggtraff.ru/123?utm_term=broncos+vs+steelers+live+stream+free+reddit
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/5065528.pdf
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fa71564914ce.pdf
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/5ddebd8.pdf
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/morutafimoxemum-segaxupetaj-wegavaz-zipiweb.pdf
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/7032144.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/481103.pdf
    • https://bakovumosu.weebly.com/uploads/1/3/4/6/134679162/8136395.pdf
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/2246242.pdf
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/9717732.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fdda2de3b2d9.pdf
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/tobozixeminil_revijejije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fe298eb7c3aac7a4b1a2504/t/5fe2aef35a00831100d03d1d/1608691444329/91697312213.pdf
    • https://uploads.strikinglycdn.com/files/7963c41c-b4ba-47da-95bc-95cc992b6428/mibunixuduv.pdf
    • https://static1.squarespace.com/static/5fdc9c6d242e893f6741e21c/t/5fdd0cfc61a1817d327ebf5c/1608322300408/81761061112.pdf
    • https://uploads.strikinglycdn.com/files/b40bfeaa-6239-4d2e-a215-dfcaddf3cc68/basketball_blueprint_nike.pdf
    • https://s3.amazonaws.com/bulolimepol/26280949698.pdf
    • https://s3.amazonaws.com/vapite/2014_chevy_captiva_service_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b77.bin
5aacead3983fd2649f290ea7c9a899308ec81fffecee1d95e5ecc79133577439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 5276 bytes
font_01_sfnt_off00011d5d.bin
80c1f4ea2d59304cd9655833e80a5aa0f322bf4ad9df607d0d0461296c8bf008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 11328 bytes

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