Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa756adfd4a3d5da…

MALICIOUS

PDF

45.0 KB Created: 2020-10-29 20:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0d20a8f53b4acd77973c2ad6be8bfdcc SHA-1: 2fc848580be58c5a9e534fd51ca6d859b8d56e3d SHA-256: fa756adfd4a3d5da1c0f7d6281a525f0e93b0b111f4b30f89cff80fd031184f7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, indicating a phishing or scam attempt. The embedded URL `https://cctraff.ru/pify?keyword=organisms+that+make+their+own+food+are+called+quizlet` is a critical finding, suggesting the document is designed to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/pify?keyword=organisms+that+make+their+own+food+are+called+quizlet In PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/6410501.pdfIn PDF document text
    • https://xirunokud.weebly.com/uploads/1/3/4/4/134467368/883809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/cours_d_automatisme_et_regulation.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/72185129638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297b0316-a70d-4012-8f9b-027ada4641e5/91527453258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8eed1ae-c247-4dcb-95e8-2a6ee505c3ff/28754229377.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/smithtown_west_high_school_teacher_arrested.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1108/3935/files/self_guided_walk_jewish_quarter_budapest.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/28857233920.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/vagelujufus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2132daa-5361-47f4-a142-55978e817427/download_coldplay_fix_you_planetlagu.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_off00006e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E95 5796 bytes
SHA-256: 041e19b696d1c1e6ea80a797afd195b3f49ee8390d4f93e4a5b39defe5f6629b
font_01_sfnt_off00008235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 11052 bytes
SHA-256: a9701a72c6474754109788dcb4d850cc3564a93f06d8a406071cc037c7f2711b

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