Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd4343dc14e33b5…

MALICIOUS

PDF

65.7 KB Created: 2020-12-14 01:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d5327341d4030dc3c8315408fa8a9d7a SHA-1: 93087e2d041863fd7b2a1aa4503695175c9429d6 SHA-256: bfd4343dc14e33b55f0ee1836ef0f34acdda4f78c04c17f941bb3d93caf77213
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of an SEO link farm and uses a redirector to an external URL. The embedded document body, though corrupted, suggests a lure related to 'Bcbs colonoscopy guidelines'. The primary malicious indicator is the redirection to 'traffset.ru', which is likely used to host phishing content or distribute further malware. No scripts were extracted, but the PDF structure and external links point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=bcbs+colonoscopy+guidelines PDF link annotation
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/sowipif.pdfIn PDF document text
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/7509954.pdfIn PDF document text
    • https://jelulepotaf.weebly.com/uploads/1/3/4/3/134383906/maposateta_zonumu_zalip_tabipon.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/14403eab70.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/829517257a.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/d3756abd-7709-4d3a-a5c2-8f1f79b5e313/60015162393.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeff018e72e5fdb9babaf/1606283260093/anthem_legendary_contracts_purple.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc111b5ff13940aa240a14e/t/5fcaf7941415195da07cc51a/1607137174700/tuvemivanesesasap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b9a67d-29ca-44fe-b8db-ac778c373912/82576113701.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/62392062430.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fc0fc4b4f9837572002d88c/1606483019853/tinder_plus_hack_apk_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0c67848ba205d186e02/t/5fc0f31e173fb5383bc3fd21/1606480671772/bemizak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21e2fce462bc8c0024/t/5fc2ebbcf81c9a2a0c0302ea/1606609853152/10454779700.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/70933014774.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f5c3c02f22b9d03c68a/1606373212847/aint_no_grave_gonna_hold_my_body_down_song.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/68436834951.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_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 5228 bytes
SHA-256: 0b79c7a954aa984b116b0c82f719311795980c7983e5cc669c409801791e9efe
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 9360 bytes
SHA-256: a7c4101feda27cb3306af721f4846655bbf55cff5117928f97e31107a5eb0c3c

Open this report in the interactive analyzer, or submit your own file for analysis.