Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75fe5304397c689…

MALICIOUS

PDF

44.8 KB Created: 2020-10-02 01:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6cd475d8b967930aac1858229e2e49dd SHA-1: bd7ebb2a5b6be20890761fc2275e3ef2e9ea1b2e SHA-256: a75fe5304397c689abcd47fa375ce96a854b04c747abea163c4b7cdafe476f50
184 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous links to external documents. One of these links, https://gettraff.ru/strik?keyword=fema+gasifier+for+sale, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://gettraff.ru/strik?keyword=fema+gasifier+for+sale In PDF document text
    • http://files.motanum.com/uploads/1/3/0/7/130738607/jafuji.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/40748947706.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/4062845550.pdfIn PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/21385019496.pdfIn PDF document text
    • https://site-1039283.mozfiles.com/files/1039283/mikarifub.pdfIn PDF document text
    • http://goxejuk.rpnathanson.com/uploads/1/3/0/9/130969186/nojiradaz-gigoketukotijaw-vumotake.pdfIn PDF document text
    • http://files.justtherightbling.com/uploads/1/3/2/8/132814664/mokowuv_fisurapiza_giwerekazero_guwene.pdfIn PDF document text
    • http://files.teachingcello.com/uploads/1/3/0/7/130775934/3bf5c.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/88f30e8d-3d4e-4fb6-9f2c-342d6ecff245/mofiponun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86fc8fb-c14a-4ddd-a055-cce2e337a62c/gonasonoxitefexazega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d74491-8c02-4538-8423-9542fb25a5f9/69503663199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d536f946-89cc-4ade-941b-05334aebd846/15043965018.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_off0000729b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x729B 5040 bytes
SHA-256: c4cf5fc7caad79e3b98dde2dc8f8bdf8cda38c034f324599bbca5c2b9e96df4e
font_01_sfnt_off000083af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 10128 bytes
SHA-256: baa242a35baff420cdf47164ad20b1174946fa12bee1398a492bbe780ba838b3

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