Malicious PDF — malware analysis report

Static analysis result for SHA-256 84207a4b565bce20…

MALICIOUS

PDF

67.5 KB Created: 2020-12-18 00:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 066d20f8c0970f09b7d19914187fdc56 SHA-1: b60a1d3238d9741a2ac281feba5fe2e8a5dfa101 SHA-256: 84207a4b565bce200b12b73b4eb5fab6b77856605aa0f81286f646a5115b50cf
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector and part of an SEO link farm. It links to a known malicious redirector URL, traffmen.ru, which is likely used to host phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=office+dinner+party+invitation+email+template In PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/5667752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5f997512c2c3e.pdfIn PDF document text
    • https://jimakujomeda.weebly.com/uploads/1/3/4/4/134438408/b7b588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5fb49a5da1819.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/2aeaf5ab-5fa7-4a7a-adbe-dfcb61593430/higher_engineering_mathematics_bs_grewal_40th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ccd8b7-b71f-4dbd-8c8f-738b66c4f1d4/how_to_build_a_trend_following_system.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79ecceddbb05c68963a2e/t/5fce9765fdedf348c4ba0c72/1607374693875/navij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7892b11f-4d35-406c-a02c-8515b4d3acc9/7375137478.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/rolole.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/28670243626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f202c896-bcdc-48a0-a2de-7fa4b1c995de/tome_of_foes_monsters.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/standing_wide_grip_t_bar_row.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 5312 bytes
SHA-256: 7471cb26142fe1705f437863114ceaa7486d43bdafa479c38cf72a32bae2414e
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 10220 bytes
SHA-256: e8fe27e3669ac445995831c0d679c80229896007aba0916f865fc4faf2c1fe18

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