Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcb9c401f621c45…

MALICIOUS

PDF

44.3 KB Created: 2020-10-11 18:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b3681704947794f072fef96b8c7626f SHA-1: 788920077d8c2dfac06abb779bc3c7997415ec65 SHA-256: 3dcb9c401f621c450119dd0c42304051c3c566d0fcb91c8db9b198fd59df9a78
124 Risk Score

Malware Insights

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

The PDF contains embedded links and the document body text suggests a lure related to 'Pita pit calories'. Heuristics indicate the PDF links to known malicious redirector infrastructure and is part of a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to malicious sites.

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://cctraff.ru/pify?keyword=pita+pit+calories In PDF document text
    • https://site-1039549.mozfiles.com/files/1039549/rekibut.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/kanil.pdfIn PDF document text
    • https://site-1041864.mozfiles.com/files/1041864/runokabobexixokawofanigur.pdfIn PDF document text
    • https://site-1039560.mozfiles.com/files/1039560/dodavipisuxegijimoj.pdfIn PDF document text
    • https://site-1038312.mozfiles.com/files/1038312/danoxu.pdfIn PDF document text
    • http://lunizix.foundtobefit.com/uploads/1/3/1/3/131382166/18fe2d2f4.pdfIn PDF document text
    • http://files.calledoutsetapart.org/uploads/1/3/1/4/131437733/8009032.pdfIn PDF document text
    • http://jolawigam.lazuliliterarygroup.com/uploads/1/3/0/7/130739963/dademu.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/d172da7f-ec4d-4268-9ec2-b97a7e0fcf5f/29329030031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef38aaf5-935e-4ea4-8edc-6135c4308311/26116949346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb50026-881e-489e-a684-5f45fdf036bd/58505433212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0acc201e-274b-473c-85d5-82bdd8b86fa6/vaguvet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc996901-4545-4829-b71e-5b5ddff4c109/gurizovipin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991ef269-10f4-4e24-9258-254add56d3ad/70096236314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abc557c-6144-4a16-9278-de77f4a923af/bodix.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_off00006625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 4928 bytes
SHA-256: b82b7314f4ea83dd675507efb4b8216de687d51b21798be42d810b7dacc42a04
font_01_sfnt_off000076ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EA 14800 bytes
SHA-256: 486dfd07ce7e718683ae772cd46e2cc9de5bf589633c3187259b0f948cf13873

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