Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6f8b5b5dd49901…

MALICIOUS

PDF

42.8 KB Created: 2020-10-04 08:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 659483e523e251e84b17458cdc4ab7a1 SHA-1: e57e0a2d28438115afa93a9b688f2cae399ff84c SHA-256: 9d6f8b5b5dd499015ff998f0ddcb255d7e4fb2bf99539b99d1e9a91a92f7ff03
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malware or facilitate phishing. The document body itself contains a lure related to free media downloads, which is a common tactic for social engineering. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links confirms 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://ggtraff.ru/strik?keyword=twilight+saga+eclipse+free+download+in+hindi In PDF document text
    • http://files.homegrownblooms.org/uploads/1/3/2/6/132695445/fitevi.pdfIn PDF document text
    • http://xevube.oneilbldrs.com/uploads/1/3/2/6/132681394/bumuzuwi.pdfIn PDF document text
    • http://files.wakeforestfarmersmarket.com/uploads/1/3/1/4/131452771/4561541.pdfIn PDF document text
    • http://tozosafom.drjeannewilson.com/uploads/1/3/2/6/132682883/zurotegow.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/zevopobugo.pdfIn PDF document text
    • https://site-1042275.mozfiles.com/files/1042275/xapudufudufufojidedotije.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/87146526367.pdfIn PDF document text
    • https://site-1040780.mozfiles.com/files/1040780/76322303853.pdfIn PDF document text
    • https://site-1043967.mozfiles.com/files/1043967/risiwamawobisusa.pdfIn PDF document text
    • http://gudox.jeromesbistro.com/uploads/1/3/1/0/131070161/3041263.pdfIn PDF document text
    • http://kujazizo.selftalktherapyservices.com/uploads/1/3/2/6/132683071/gexosezepekuwademul.pdfIn PDF document text
    • http://files.ctyribuchty.com/uploads/1/3/1/4/131437865/21869.pdfIn PDF document text
    • http://bolepo.windhorsedancer.com/uploads/1/3/0/9/130969373/ganadizewuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000068a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 5456 bytes
SHA-256: a479e5f528699f6f09b276be32061cc39a5590505d1fe2eda548537b07f28a9b
font_01_sfnt_off00007b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B43 10284 bytes
SHA-256: 54d364161b07466b0b37b80a35f8c8c1104ace7e7687e1b18bfbbf657cf8cc45

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