Malicious PDF — malware analysis report

Static analysis result for SHA-256 445061a20c9b87d4…

MALICIOUS

PDF

96.3 KB Created: 2020-11-05 02:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 283685140489eb29cf02de8cc553490c SHA-1: 8aa1b15e1fe13a577aff57af095faaf96d1fe7c5 SHA-256: 445061a20c9b87d4831eb54620c6f8b3cda1ed332b77ef9919fee8b91a9f338c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the extracted malicious links, suggesting an attempt to direct users to harmful content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=nuremberg+trials+1940 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f96060d6555b.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/019da7bcb.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/gawejojesofuku.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/8045519.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/16ca83a9496a412.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/sejiliduzika-danuwefitap-sotuvakuxo.pdfIn PDF document text
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/2ceb198b48b7.pdfIn PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/gadasuxuwud-buxaboxenadu-suboxas-wajupiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/baker_kisti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9474/8573/files/tabedupunelobunazoviro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8904dc-3c7e-433c-b235-23f42ab95073/32135448750.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/bolupokigilega.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/77782567797.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

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_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 5552 bytes
SHA-256: 03b5073e56d5a3643a4dbba2eb6dc9e3cc449fd7dde8d1f0550d87439175bc6e
font_01_sfnt_off00014c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 12332 bytes
SHA-256: 20452fc885ecc8988f6bef4a18475a0835e633ecb3b538c558a6eb822f08228a

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