Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fdefc3bb20d27a…

MALICIOUS

PDF

31.8 KB Created: 2020-11-04 13:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 332125dac5a432a8b9007c328e210401 SHA-1: 194c2d8572242214931f3e2442abfe091554bae5 SHA-256: c0fdefc3bb20d27ac38ec9b4cf32fe2c33b6d07699d123ada7fb290608b6d3fa
204 Risk Score

Malware Insights

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

The PDF document is designed as a lure, presenting itself as a screenshot of a product listing to entice users into clicking a link. This link, identified as a malicious redirector, leads to further infrastructure that hosts additional PDF files, likely for SEO poisoning or to distribute more malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points towards a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 31 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/123?keyword=mickey+mouse+coffee+mug+warmer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f91720a92904.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/04ac323ba38.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/992572.pdfIn PDF document text
    • https://pamarilu.weebly.com/uploads/1/3/4/3/134322341/pekutema.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/7329919.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/4403798.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/9011098.pdfIn PDF document text
    • https://bevalapiwilidi.weebly.com/uploads/1/3/4/5/134587476/7434892.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/8da804480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3112/2843/files/bonefa.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/bless_me_ultima_literary_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/befewagarime.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/causas_de_abdomen_agudo_quirurgico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2163/4206/files/what_is_incapacitation_in_law.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_off000043b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43B1 5432 bytes
SHA-256: 8576711de7e05b7c10967bcca5a0e88f2aad78fae1a50ea56014d08b09016336
font_01_sfnt_off00005644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5644 8136 bytes
SHA-256: 1d2f543a9abbfee3fce82945f43d9b93d2582a74bbcd52279e977ee0460fbedb

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