Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceba65d70a3571e0…

MALICIOUS

PDF

38.7 KB Created: 2020-10-07 21:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 687b2ecde0f8584eccecf508b892caec SHA-1: 6beb65185d08eea12d76790067251fe20eaf2839 SHA-256: ceba65d70a3571e08667ef6f38ae2c815ddf2e24f786d414d7e2956a569841a6
154 Risk Score

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://cctraff.ru/strik?keyword=visual+impairment+in+the+classroom+pdf'. The document body also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous links to other PDFs, likely to obscure the malicious intent. The ML classifier 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/strik?keyword=visual+impairment+in+the+classroom+pdf In PDF document text
    • http://files.puravidahealingarts.net/uploads/1/3/1/3/131384605/1260194.pdfIn PDF document text
    • http://files.fustlerthefemalehustler.com/uploads/1/3/0/7/130739839/gaxiwoloxakutenuboj.pdfIn PDF document text
    • http://lufalujel.theglassforeststudio.com/uploads/1/3/1/4/131437241/7258355.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/1/0428/6464/0159/files/fijakeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/fiwiwopifilaledemim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1141/0590/files/kenilworth_junior_high_school_edmonton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/shallot_vs_onion_carbs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/jijatezirepamesisobuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4674/3449/files/56074510416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9192/2596/files/golf_break_80.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_off0000559c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559C 5360 bytes
SHA-256: dfd35849c220d4e7e0476c7831e84ae737a1fdfa579bdac825c0a17c44014d96
font_01_sfnt_off000067a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A9 10644 bytes
SHA-256: 352e0580efafbfa4e84f3a5b95e052cec4edfc9f4bea582c6b72a3894fb9bd17

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