Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff04aae44c7c85…

MALICIOUS

PDF

40.7 KB Created: 2020-10-06 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9877eb20b378a1f9b83037444bc68258 SHA-1: 846fcae485caabd145c62abd9b82833c4af53487 SHA-256: 42ff04aae44c7c8529b2d4bbb49e0f341f0e2ced78280a0dff50a8da8d161388
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, which is part of a link farm designed to host numerous external PDF files. The document body, though heavily obfuscated, contains the string 'Jay z discography download kickass' and a URL that matches the malicious redirector, indicating a lure for users to click on malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=jay+z+discography+download+kickass In PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/21703238673.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/zolawexaxazifes.pdfIn PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/felap.pdfIn PDF document text
    • https://site-1042983.mozfiles.com/files/1042983/92264163607.pdfIn PDF document text
    • http://vadinu.tkotupperware.com/uploads/1/3/1/6/131636627/f4249e53.pdfIn PDF document text
    • http://fulewam.hambleden-wi.org/uploads/1/3/1/6/131606666/839b9.pdfIn PDF document text
    • http://files.lovettadvisors.com/uploads/1/3/2/6/132695334/tuzetenozapevik.pdfIn PDF document text
    • http://posapasa.healbflo.com/uploads/1/3/1/3/131398455/zifazopuvepax_sodamekuxar.pdfIn PDF document text
    • http://files.alumniumf.com/uploads/1/3/1/3/131381605/519552.pdfIn PDF document text
    • http://tigoxige.isabelleduchene.com/uploads/1/3/1/6/131606402/8876804.pdfIn PDF document text
    • http://files.upcowildandscenic.com/uploads/1/3/2/7/132740951/1309486.pdfIn PDF document text
    • http://verufom.iaptprn.com/uploads/1/3/2/6/132681579/83ac5cc91dd2.pdfIn PDF document text
    • http://files.thegoddessattainable.com/uploads/1/3/1/8/131856695/1197409.pdfIn PDF document text
    • http://jevagil.japanskitours.com/uploads/1/3/1/4/131407995/3a7e6b33a41f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

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_off00005ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 5632 bytes
SHA-256: 4f7f43bb4622a700f378dec94c8efec689fef575c1f349c3bdad811e031b5856
font_01_sfnt_off0000722c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 10440 bytes
SHA-256: beed9e72c4cfb7ebc263d7054fdb515686f6846319aa8a02a3ae28e6bb629350

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