Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f18de1a3e89691…

MALICIOUS

PDF

47.3 KB Created: 2020-10-09 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b10125e8e44cb75e64b87beeb8c44d3 SHA-1: 9433fb99c6107f2eb486aba857a213305c7a8078 SHA-256: 41f18de1a3e896919aa654c7c729ca3029366f92a497be4abf24e535936a0b61
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links to potentially malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external, potentially harmful content, consistent with a phishing or spam campaign.

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://ttraff.link/pify?keyword=demon+eyes+kyo+soundtrack In PDF document text
    • http://jemiluf.morgancountydemocrats.net/uploads/1/3/0/8/130874247/5726155.pdfIn PDF document text
    • http://files.tenderheartsppd.com/uploads/1/3/0/7/130776327/b8cb1d1.pdfIn PDF document text
    • http://tenogop.21stcenturymediaplanning.com/uploads/1/3/1/4/131437889/4753ca285522be.pdfIn PDF document text
    • http://zijeke.naylahstrisomy5q.com/uploads/1/3/0/7/130740490/3603565.pdfIn PDF document text
    • http://files.sunrisepsychologycouples.com/uploads/1/3/2/8/132814220/xapujuvuwijeki-fibipevijega-devebuw.pdfIn PDF document text
    • http://files.sschroeder.org/uploads/1/3/1/0/131071082/3416541.pdfIn PDF document text
    • http://kuxofuri.northsidepresby.org/uploads/1/3/0/8/130814407/pifumovurux.pdfIn PDF document text
    • http://files.bluebellhill.org.au/uploads/1/3/0/8/130814605/374201.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/1c4c2a3d-9591-428c-91ee-418ccbf01c7e/83094740748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ee75e0-cff1-44da-8a91-7e5623bbe99b/derokodejofopivuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddae85b5-1162-40ac-8085-f091e00f184d/8202099549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a577a1f2-6b72-4406-bb28-3b63fbcc6bbb/16683631685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a07afb4-b3cb-4d9a-8681-a594fdef18ef/96979199716.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_off00006e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E45 5220 bytes
SHA-256: 1d22fcf5b75bef8fab11cfccb1f24ea30b3eb069b99470be9c5e8bd7a3d0f950
font_01_sfnt_off00007ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 15008 bytes
SHA-256: a45389487b9e9ab0703b2f3304d1e614ba5d81d01c616124eb3a591a1fc49f02

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