Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafcb4ab678801be…

MALICIOUS

PDF

53.3 KB Created: 2020-11-05 06:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 31c23f8c9d72c1bcfebab2b48485571b SHA-1: 31a7e38c94f3a90e068715dc8dacd3e9b0b4b2b5 SHA-256: bafcb4ab678801bebd7fec00606ae5383666659b58345b701b6e46b0c32c82a8
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.me/123?keyword=histograms+and+dot+plots+worksheet+answers`. This URL is likely used to lure victims into downloading further malicious content or engaging in phishing. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a common pattern for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/123?keyword=histograms+and+dot+plots+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f96003cb5226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8778c96cf18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f8f3dfab62ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f8b71645d120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f9bd66257a6d.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/752b299f-1ed6-4cc8-9908-8f7f005fb708/bapagipapidokavegavubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a691006a-3918-48ba-8cc6-ec199236b4f3/vodadeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2edb81-ac66-486e-8bcf-d46a8185af33/international_4300_dt466_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afa5463-e041-4a2b-b9aa-8d12bc5cdfc9/grace_king_high_school_alumni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21191f48-2c41-41cb-a88d-898a4857f6db/nemekidutupifus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d8db6a-81d6-4e6f-8360-fa5e39f29f34/66473426412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4f5be2-e1e4-4df0-a233-45fc98c88561/sibovofivopejod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52eeb97-93cc-4015-b338-6c2463974f8c/12147309301.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ead.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9EAD 23884 bytes
SHA-256: 4892bfdb40b94359e8c904926b67770b9df143b568475ab2f46759fd4e154b09
font_00_sfnt_off00006726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 5488 bytes
SHA-256: 9f1736527359b5869b1294f683cf33b733aead4519079b4406bee3930d94ffc0
font_01_sfnt_off000079b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 10852 bytes
SHA-256: ad7442a8c893736bc5e4958f3836c9b42ffa577b85cd66f046f47e55f5482cc7

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