Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dc87e28bac4ac0…

MALICIOUS

PDF

42.8 KB Created: 2020-10-06 13:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7079190bb9f461985614cb1da1245d9f SHA-1: 746c1acf5cb87f6d1b300ba3593124edf309db6f SHA-256: f8dc87e28bac4ac05e95f477dd0ecee80c5cfaf12eb96713113702b2b25e08c7
124 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'ttraff.club'. The ML classifier strongly indicates maliciousness, and the PDF is identified as a link farm on disposable hosting. The document body itself contains the primary malicious URL, suggesting an attempt to lure users to a scam or phishing site.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=1+million+trillion+in+scientific+notation In PDF document text
    • https://site-1037267.mozfiles.com/files/1037267/39716081670.pdfIn PDF document text
    • https://site-1043119.mozfiles.com/files/1043119/mavepikujukudat.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/gadeximun.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/22685890700.pdfIn PDF document text
    • http://files.sevensieteset.com/uploads/1/3/0/8/130874285/wibumonizib.pdfIn PDF document text
    • http://tigagufop.isabellepeterson.com/uploads/1/3/1/4/131453853/3880bb6310.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/1/0496/1258/7171/files/2011_ap_chemistry_free_response_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5596/7125/files/i_cri_evrytiem_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623b7621-c30b-41b4-bf75-c646656de254/libalesixinasoxoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a6b95a-4634-4473-a56c-a3b5a6edc636/48249998438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397bfbae-17e0-4270-aec0-deb21bb85ef3/pifuzimufixapejufovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52afcfca-8502-4aac-b96d-0df9b895ce12/pawere.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_off000062d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 4984 bytes
SHA-256: da38be8e1176adf6f24518cbefdacbe84e89600af49f8dda3b1dea5e3b976d29
font_01_sfnt_off000073ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 13652 bytes
SHA-256: 470af75d5b25eccdb895cad7d73cf0a477261a77a8c322a9d4ff6e573a3f45a2

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