Malicious PDF — malware analysis report

Static analysis result for SHA-256 351793dcd2f4b495…

MALICIOUS

PDF

47.7 KB Created: 2020-10-09 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 879eb329baf8712caf87d6e819567bd3 SHA-1: 8d1c5de01033128981dd3604b5dad384ca8e2586 SHA-256: 351793dcd2f4b495fb8a4baf6b53a86acfc60454a78856b373709b8bd799e2d4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though obfuscated, contains keywords related to product searches and the tool used to generate the PDF, suggesting a lure for SEO-based phishing or spam campaigns. The ML classifier strongly indicates maliciousness, and the heuristics point to a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://cctraff.ru/strik?keyword=graco+booster+seat+with+back In PDF document text
    • http://monikoweg.ranger-stories.com/uploads/1/3/1/3/131398064/loxutasowawo.pdfIn PDF document text
    • http://files.chipsautumnfarm.com/uploads/1/3/1/4/131406352/3823608.pdfIn PDF document text
    • http://fawivizuf.sdadata.org/uploads/1/3/2/6/132682347/mavebexinised.pdfIn PDF document text
    • http://files.tasteofpariscarryout.com/uploads/1/3/1/8/131856029/ba45bf260fa0e02.pdfIn PDF document text
    • http://puxesaz.chidonhatanakh.com/uploads/1/3/2/6/132682404/senevavosibejufinusa.pdfIn PDF document text
    • https://site-1038857.mozfiles.com/files/1038857/56403818244.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/tafimavezapamerag.pdfIn PDF document text
    • https://site-1038792.mozfiles.com/files/1038792/wonubige.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/52673506752.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/98216530088.pdfIn PDF document text
    • http://files.whyiwrote.com/uploads/1/3/2/6/132681488/xotawavasesiwa_luvozesujerix.pdfIn PDF document text
    • http://files.ohsart.net/uploads/1/3/2/3/132302773/7612511.pdfIn PDF document text
    • http://jeresufof.lynchbaseballtraining.com/uploads/1/3/0/7/130738720/cf737c54c3.pdfIn PDF document text
    • http://files.thesoccerdistrict.org/uploads/1/3/1/1/131164260/rawofijamitipona.pdfIn PDF document text
    • http://tuwuzek.joshuaduncanartist.com/uploads/1/3/2/6/132681579/gomefare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659D 4864 bytes
SHA-256: d7437d73d8d30162a6bf2d02ea47778b79e9aec76c35df5e26cf43a60bcda07b
font_01_sfnt_off00007647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 14428 bytes
SHA-256: 07a58ea591d738cbd85117c55a24d960de2ba347fb7cb0d66e9881330e6d3b85
font_02_sfnt_off0000a3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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