Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8af84546adf452b…

MALICIOUS

PDF

40.4 KB Created: 2020-10-05 15:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9177ee80ee2439ad41b4625ccaae6198 SHA-1: 8d0f4a944e697ec1cfbf24c8e850dc84b4fb5fb6 SHA-256: b8af84546adf452bc49b0b25b81aabad36c2d82d247fbf3ff38a6c2fa688f800
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ggtraff.ru/strik. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains references to the malicious URLs.

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://ggtraff.ru/strik?keyword=a+practical+guide+to+faeries In PDF document text
    • http://dazebo.pmlaboratory.com/uploads/1/3/0/9/130969600/9861968.pdfIn PDF document text
    • http://files.mtzionkalamazoo.org/uploads/1/3/0/9/130969316/e68f9025574.pdfIn PDF document text
    • http://navow.aoerecording.com/uploads/1/3/1/3/131381067/zokalamapojiguxilo.pdfIn PDF document text
    • http://wewekev.lafayetteorchestra.org/uploads/1/3/2/6/132695569/muxekewekijox.pdfIn PDF document text
    • http://daneki.trailcoffeecompany.com/uploads/1/3/2/6/132681790/nofumobana_jaraza_kejopa.pdfIn PDF document text
    • http://files.drmonicamody.com/uploads/1/3/1/3/131379340/98b0b3f8.pdfIn PDF document text
    • http://files.vinsvinos.com/uploads/1/3/0/9/130968917/1675b8a026e6b0.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/0bbe1e1c-cf4b-47b2-a9f4-246a05c13f60/luxawunemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bb9fb8-c659-4e4c-b56b-e5a272c232a3/jegowedizidavuduxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e634dc-099c-441f-892e-5cc5b92cb4de/79390533588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6074/6408/files/creekside_swim_club.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8276/0601/files/16377885978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5425/0654/files/kryptonite_three_doors_down_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/lazevotu.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_off00005ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBE 5312 bytes
SHA-256: bc1e9521a468cd48f2a0e6ff7d4ef0b4cb22eb827b9b413110d5aff7b3566d62
font_01_sfnt_off000070dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 10540 bytes
SHA-256: a50b57f5ef3ceb48ae8f195c68fce93332e405e0615e7e39cf28f79c45f02414

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