Malicious PDF — malware analysis report

Static analysis result for SHA-256 3235d5af6d461e44…

MALICIOUS

PDF

48.1 KB Created: 2020-08-19 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f33714d62bff28aac35d483a7fe025 SHA-1: 98f785cd2cded519b85647d14f80ee212854db0a SHA-256: 3235d5af6d461e44f30a79c287e87260099c8eb856c696d0d0d0cd489a580cf8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the text 'chota don comedy free' and the malicious URL, suggesting a lure. The 'ML_NYX_PDF_MALICIOUS' heuristic further supports the malicious classification. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely to improve search engine ranking for malicious content.

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.com/pify?keyword=chota+don+comedy+free
    • http://pebeli.treasurevalleypressurewashing.com/uploads/1/3/2/7/132712050/8a4e5.pdf
    • http://gizade.catholic-teaching-alliance.org/uploads/1/3/1/3/131383478/4289763.pdf
    • http://files.sustainabilitysciencelab.org/uploads/1/3/1/4/131453255/83cd1999e47e050.pdf
    • http://files.ricelakemodelairplaneclub.com/uploads/1/3/1/4/131407572/mamibaji.pdf
    • http://files.90sinmypocket.com/uploads/1/3/0/7/130775032/maxoxinonomujegobes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/corredores_biolgicos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3507/files/favedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/social_psychology_david_myers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/80298965366.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/gesalonutotidodipejut.pdf
    • https://cdn.shopify.com/s/files/1/0440/7105/9608/files/aachar_sanhita_rules_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0443/7049/3596/files/airman_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/airfix_model_world_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/viruxirekosarobavogerij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/jelatukonaremod.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af0.bin
ed483f7e69ae831d07a7db1bab152ff107ac45cd27a9db1668cefa8a54f36470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 5056 bytes
font_01_sfnt_off00007bf5.bin
bf559e1e4e0af2d49fab26779f285d0fec65a7a9b9db417777e295303aa88772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 10708 bytes
font_02_sfnt_off0000a0a4.bin
a004616293ed1d9344092d7cff1c0b0c5a7bf1294d7f0eace7b0d198008b6835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A4 5168 bytes

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