Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f38e17a7efd652…

MALICIOUS

PDF

41.7 KB Created: 2020-09-30 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee75041962aa202f654d40944bfa02ef SHA-1: ac902779f6d48039ac379f4b01fb225acd7094e7 SHA-256: a4f38e17a7efd6525476f3b0545536bcbe3019562d2fb25ff52ecd27d7c348c6
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=chandrayaan+2+essay+in+hindi+pdf', which is flagged as a malicious redirector. The document's structure and content suggest it is designed to lure users into clicking these links, potentially leading to further malware downloads or phishing attempts.

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=chandrayaan+2+essay+in+hindi+pdf In PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/zezifobazonisaditosu.pdfIn PDF document text
    • https://site-1038532.mozfiles.com/files/1038532/20388267840.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/93046429473.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/27484152162.pdfIn PDF document text
    • http://duvupegas.votejasonmcguire.com/uploads/1/3/1/3/131380600/f07793a41e.pdfIn PDF document text
    • http://tivasewi.best4older-lgbti.org/uploads/1/3/2/6/132683051/tupekaki.pdfIn PDF document text
    • http://files.junedulshahid.com/uploads/1/3/1/3/131397973/06700.pdfIn PDF document text
    • http://files.martamoranbishop.com/uploads/1/3/0/8/130814172/zipojo.pdfIn PDF document text
    • http://files.mdflatt.com/uploads/1/3/0/9/130969837/7582866.pdfIn PDF document text
    • http://files.cartersgrocery.com/uploads/1/3/1/3/131381614/soraj-dejujagemup.pdfIn PDF document text
    • http://ludozu.lovethetruth.co.uk/uploads/1/3/0/9/130969808/wixisoxesud_pazukida_nenil_tifiral.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aafb132-0db5-4ed4-a486-0f1c878d6c23/50493628989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cddc3f-97ff-47e4-a71d-ec6b23f06059/zisevuxapuvuxasizajiman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb47be9-252b-4bde-8993-df5dcbede30d/tomabarejiwuta.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_off00006688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6688 5236 bytes
SHA-256: 0d2428a49d6b79ec272011ec4b79d1425851f659e11ab32b1d6f4b38f891eee1
font_01_sfnt_off00007857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 9936 bytes
SHA-256: 36b458f3386be764771d56567f6440c7a45302018300ee857f7726ca9897eb6e

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