Malicious PDF — malware analysis report

Static analysis result for SHA-256 422b9163a218ce04…

MALICIOUS

PDF

74.0 KB Created: 2020-12-30 23:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 48407319cc929d20943306e9dcdd2ff9 SHA-1: 9efa255a2268ca5233f7169534349e3fc1aa16a0 SHA-256: 422b9163a218ce0403f4ca1edc2c0116cec02b907c7decae6150a92bc76cd3bd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, containing numerous embedded URLs pointing to external PDF documents hosted on various disposable domains. The presence of a redirector link to 'traffmen.ru' suggests a potential for malicious redirection or traffic generation. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of malicious intent behind this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=video+maker+online+free In PDF document text
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/dinurowimam.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/igjecnz/86187417725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fe87f083e581.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/8562250.pdfIn PDF document text
    • https://dumiwexadanona.weebly.com/uploads/1/3/4/5/134522913/zotipivijovakaka.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/nojetugovirolume.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/N2QF2jg/ff_live_streaming_hari_ini_persib.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/pgeHgei/10126672500.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/pizibiwe.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/6c99cdd.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/zifozujiwi/akali_combo_guide_s8.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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 4904 bytes
SHA-256: 3c03d40a84e71396afaa46ed9eb479fb315802bd01a62da44feff71917fa5832
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 11116 bytes
SHA-256: 6f99e499994cb5e74200cb6066ac829be180f95d62877a7be9106866b542ccb9

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