Malicious PDF — malware analysis report

Static analysis result for SHA-256 b850ae64471ebfdf…

MALICIOUS

PDF

41.7 KB Created: 2020-11-07 15:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5e64f74bc1adfb49cc843e1a299921a0 SHA-1: e0f005882ab4e6048eb4d545a0eeaa966c5c38d5 SHA-256: b850ae64471ebfdf9df4ed4df443fc98e0cafd0515c8040a35978069fa8257a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one specific URL related to a 'universal tv remote control app for android'. This suggests a link farm or SEO manipulation tactic designed to drive traffic to potentially malicious or scam-related websites. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?keyword=universal+tv+remote+control+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f91e2a6030ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fa32faad2639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5f947415d23ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59171b61-109f-4fbb-ab88-543b3ec27945/93936939919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a66f98-3169-4db0-8ddb-209ad1edf953/letting_go_david_hawkins_youtube.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdfIn PDF document text
    • https://gezovuxa.files.wordpress.com/2020/11/49165319915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e682f04-bae0-4732-95f5-1639b5917fd0/ragowijatulowumubevatil.pdfIn PDF document text
    • https://fovekurosuto.files.wordpress.com/2020/11/lotukiruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204e2f3a-03f5-4148-bd05-fbcf2341d6c6/rorepawomez.pdfIn PDF document text
    • https://lepunesibim.files.wordpress.com/2020/11/99828904323.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_off0000645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 5352 bytes
SHA-256: 454e100697aeb300504f3765ef8b4f60169e06bdf2058b660c79d2d5e55f4dcb
font_01_sfnt_off0000768a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 10504 bytes
SHA-256: 5fc56f0301a46541a29188d89de6ea8986c2aec960b24485e205b44aab2b9606

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