Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d20d789d967cf9…

MALICIOUS

PDF

82.9 KB Created: 2020-09-16 22:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: aaadb029d23d5fa86b610e020e35c871 SHA-1: cee4d9e7797198924ddb738d8e70ef26e57fc994 SHA-256: 51d20d789d967cf9778abe4604942f5cc74c8a601fd3b02e6695e03ece945f56
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'father of faith' and the authoring application 'wkhtmltopdf', suggesting a lure document. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a campaign focused on driving traffic to potentially malicious 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://ttraff.club/wix?keyword=why+is+abraham+called+father+of+faith In PDF document text
    • http://kokebokob.practicingforever.com/uploads/1/3/1/1/131164250/635182.pdfIn PDF document text
    • http://pofexox.forestfreshproducts.com/uploads/1/3/1/1/131164250/gefututexodevo_nozawomot.pdfIn PDF document text
    • http://dogixuz.statisticsfromatoz.com/uploads/1/3/0/9/130969439/1055143.pdfIn PDF document text
    • http://sulevul.chelseacakecompany.com/uploads/1/3/2/8/132815028/d4d645c.pdfIn PDF document text
    • http://files.ess-inc.com/uploads/1/3/0/7/130775633/terukipejaliw_wupuvudusimi_kezetisawotig.pdfIn PDF document text
    • http://nukivowe.notsogrownuppodcast.com/uploads/1/3/2/8/132814930/a14f23.pdfIn PDF document text
    • http://firudi.atvdeserthome.com/uploads/1/3/1/8/131871699/buwubovenipima_bumanowet.pdfIn PDF document text
    • http://files.wlheritageday.com/uploads/1/3/0/7/130738748/9947797.pdfIn PDF document text
    • http://files.jessicaleemanton.com/uploads/1/3/1/3/131384797/265a1962db2.pdfIn PDF document text
    • http://jazeva.wildflowerpilgrimage.org/uploads/1/3/1/4/131454899/tofok.pdfIn PDF document text
    • http://gugedowu.fitnesssavage.com/uploads/1/3/0/7/130776257/2ebaa3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e65b469-2473-4c7a-9586-3ca42e264ebc.filesusr.com/ugd/3e5db3_39f43970d139471a8819936427bb4693.pdf?index=trueIn PDF document text
    • https://267c448d-f37c-459a-aa1a-9a0ee3fc7fad.filesusr.com/ugd/0582e0_98258fe0f1f14117b5500c0fd717f560.pdf?index=trueIn PDF document text
    • https://4cfe1f6f-3fb6-44df-a7a8-ffa9320bdfa4.filesusr.com/ugd/12dc78_d22bb2ed6da645eeb3e9bdfd11c93c87.pdf?index=trueIn PDF document text
    • https://e707988c-1002-4cf1-a661-685625686699.filesusr.com/ugd/510a18_2f08716763344417aaed64585f815032.pdf?index=trueIn 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_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 5516 bytes
SHA-256: bb77f3a56386b6ae9b3c2dda73fcfb776edba4af587a4a4bdaf7e12e38cdac5b
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10132 bytes
SHA-256: c28327b5f39f164b14ae90ae0f5adb018409891adc3a6f9c1072e8787af91366

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