Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d642bd7a46a529…

MALICIOUS

PDF

34.8 KB Created: 2020-11-02 04:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b19f36a1d90d7c220b5a237f1ee65cca SHA-1: 7c38bbc6a452b3317e1ceda190acf5cd0abf570d SHA-256: 89d642bd7a46a5292b2f27273f6d24d79a7cc29e90463d9c069930ef60efdfd8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains the URL 'https://ttraff.club/123?keyword=activity+3.2+unit+conversion+homework+answers', which is also flagged as a malicious redirector. This indicates the primary purpose is to redirect users to malicious content.

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 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.
  • 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://ttraff.club/123?keyword=activity+3.2+unit+conversion+homework+answers In PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/330176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f92afc64a4be.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/1/0266/9861/2918/files/34780730582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcffc289-d47e-4cdd-bcfe-070b33adb925/boite__moustache_statistique_exerci.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bulk_modulus.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/82360358336.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/pexelewewuladojemod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aa1791-47c5-46d4-85df-293049b40161/90750676274.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/rorujukimib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf73f4b-6a28-464b-8ab5-d535156406ec/2005_toyota_corolla_fuel_pump_wiring_diagram.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_off00004453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4453 5640 bytes
SHA-256: 9b8a40fd240c00bd623f46fd95138c4f5ff18a17a5e83b4fe214623cb635a70e
font_01_sfnt_off00005782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5782 12352 bytes
SHA-256: 72fd5b1d09756c7f1db08eb501df65e16265eee9c796ae3565ae864d8a16ae1c

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