Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77c3e3a24a91361…

MALICIOUS

PDF

42.2 KB Created: 2020-09-30 13:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e72997755cfc00c43408a6d083c0bee SHA-1: 59be99fc1858940c4f75dd9da43ec0abbcb676e4 SHA-256: f77c3e3a24a9136172d4a3c2e1a0a1dc153d5d7df2057bc7ad614277e93bebf6
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=estimation+and+costing+book+pdf+for+electrical`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=estimation+and+costing+book+pdf+for+electrical In PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/50057066926.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/dorixeminariduvov.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/60697985645.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/rolabagozukonil.pdfIn PDF document text
    • https://site-1038729.mozfiles.com/files/1038729/zikiwexuzu.pdfIn PDF document text
    • http://files.ridesgr.com/uploads/1/3/1/4/131437676/wugejotowupon.pdfIn PDF document text
    • http://sugek.zzsalesne.com/uploads/1/3/0/9/130969061/zalewexawusu.pdfIn PDF document text
    • http://files.nataliedeeb.com/uploads/1/3/0/7/130739190/1acefda4.pdfIn PDF document text
    • http://wisuj.psnproperty.co.uk/uploads/1/3/0/8/130874150/fed727bf4a0cd.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/54893042259.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/6894060176.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/47659749793.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/2ff1a27c-5ddf-41d0-b1bc-e0d9e6c46eca/59107832900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2701998d-2ba2-4f58-8f75-c2f60036c440/70491004837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8c18c9-35b6-410f-bce6-9672c6b651ff/lowogozowibutugikapimulip.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_off000066a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 5636 bytes
SHA-256: 96a06c05f9f553c6ff2a540598837a9acfbd445d6142420a53197723c06cc09e
font_01_sfnt_off000079b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B2 9980 bytes
SHA-256: 2a275a208d598e4480fb277565b47e17f61009aeb738b3daffe3d27f6dfb7a31

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