Malicious PDF — malware analysis report

Static analysis result for SHA-256 157dafe9751132a6…

MALICIOUS

PDF

46.4 KB Created: 2020-11-09 10:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 08d369b13b4405e52ab8ae88089339be SHA-1: 56da73d9cd7dd4d98a3cf853ddb074196d63adc6 SHA-256: 157dafe9751132a6a56c1292480b1a3fa6e39647b217be46e296a8c135d03556
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many pointing to disposable or SEO-optimized domains, constituting a link farm. One of these links, 'https://traffine.ru/aws?keyword=fox+nfl+kickoff+cast', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to potentially malicious or unwanted content through this extensive link farm.

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://traffine.ru/aws?keyword=fox+nfl+kickoff+cast In PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/zixokudi.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/49ac9dd2d69e2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5f99113998397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fa7a2ae887b1.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/togiluxafik-kipesegeluwedas-juwisoxoweruzi.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/5604100.pdfIn PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/8903000.pdfIn PDF document text
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/wifakev-lawaxekesibub-xasixoragojebi-luvafowademoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bafelego.files.wordpress.com/2020/11/acadia_national_park_hiking_map.pdfIn PDF document text
    • https://ziruvetod.files.wordpress.com/2020/11/88921194436.pdfIn PDF document text
    • https://wezodik.files.wordpress.com/2020/11/59584403987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad63bc0-721c-44de-b31d-7f8160d0b31f/mobdro_apk_mirror.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_off00006b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9B 4864 bytes
SHA-256: 1508058b36d6017429e6b7082198cb21997a4342edf96b20c4907e1c84fbd41d
font_01_sfnt_off00007c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 15840 bytes
SHA-256: 3e6edb3f89565c892bf6f1dc29ba048dd76b070f09da47e53ff063cb43c8c897

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