Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a6b986811bda08…

MALICIOUS

PDF

36.1 KB Created: 2020-08-09 01:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f1dc27662e86bd0a320ac7d874783a5 SHA-1: 0295d7407bff2132af119110d5d981b6d814195c SHA-256: 11a6b986811bda08042b64b702f964e0bf36701a06d00ad29b070d17f725e29f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which point to external PDF files. One URL, 'https://ttraff.ru/pify?keyword=cuaderno+de+investigaci%25C3%25B3n+en+psicolog%25C3%25ADa+social+uned+pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing 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 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://ttraff.ru/pify?keyword=cuaderno+de+investigaci%25C3%25B3n+en+psicolog%25C3%25ADa+social+uned+pdf
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • http://files.sehjournal.com/uploads/1/3/0/7/130776058/kofaj.pdf
    • http://files.icves2020.org/uploads/1/3/0/9/130969907/79b8ef29d98b3.pdf
    • http://files.sports-journalism.com/uploads/1/3/1/8/131871705/25dadf3b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/14230176788.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/56017771868.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/zupux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/21630976444.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/40149744147.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/xogifolojusudinezididazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/22150357375.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8419/files/pokemon_fire_red_cheats_rare_candy.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/dosebezapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/balanced_scorecard_kaplan_and_norton_1992.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/dumurusawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/koxisovokakefamuwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/xalokemazaderaluwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0247/files/75078720634.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/20049439544.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c8c.bin
b19ca8bf95d6cb59a1b195cead784feae031193a1ae3ccb22fb0d9c07dd14be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8C 5476 bytes
font_01_sfnt_off00005eff.bin
69b261aee41b5c3a92c8341bc8afd35cdb0b2ef6ffde5abf90e8149adb6c4bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 10176 bytes

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