Malicious PDF — malware analysis report

Static analysis result for SHA-256 542475019c01a7aa…

MALICIOUS

PDF

43.4 KB Created: 2020-11-05 18:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 74d74127f76ed0cb86eec4c9dec16ffc SHA-1: 8fb42270378f0533859e8358cfb3cff71bc16f97 SHA-256: 542475019c01a7aa8b7180c673deeddc11dd28103a543de99423e3acc29ac0d0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to a redirector URL, 'https://traffmen.ru/strik?keyword=hit+and+miss+engines+demo', which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous PDF links indicates an attempt to create a link farm or distribute further malicious content. No scripts were extracted, but the overall structure and linked URLs point to a phishing or malware distribution scheme.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/strik?keyword=hit+and+miss+engines+demo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_5f9b0cdf48d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f8fbef5bb150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f873dc935678.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/kakabaxifikobujumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5fa37478854b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f9f28003fcec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8d5a449e12f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2159/8372/files/pilates_premier_xp_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6ae016-6a6d-4e03-b176-e0406de4faa3/32819189343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2ffecd-0df5-4104-9c4d-58bd0ecb31df/muvawagotag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0196acc-e2e2-4252-9442-92e7ced52c50/lg_oled_optimal_settings.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_off00006b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B65 4976 bytes
SHA-256: 1d6456425d186077badce100a8b9c2f360eba048f0bae230548bc17d3b61dae7
font_01_sfnt_off00007c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3D 10752 bytes
SHA-256: a69ba3eb3f15d23d153e82e1072c8de4d77a255296d4474bde9639624fa8dc0d

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