Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1992833d10dc6f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 02:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d64e275d2c702b0c531c46e340f8de4 SHA-1: 8ab74d8221595ceff2b5f9c329788ca0da8ed9ba SHA-256: ca1992833d10dc6fdffe51f6c4085aeab704d0bce158b07e43aff6acbca4c67d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be SEO manipulation or content distribution via a large number of links.

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=naming+carboxylic+acid+worksheet+pdf
    • http://files.rintheyordle.com/uploads/1/3/2/6/132696263/zaluwovekire-vuduxalabomo-darofogososonef.pdf
    • http://gatite.jvjewelers.com/uploads/1/3/0/7/130775607/9d2d13ef1a.pdf
    • http://mutidude.progressplace.org/uploads/1/3/1/6/131606349/1978203.pdf
    • http://rabazawil.savannahclaycommunity.com/uploads/1/3/1/1/131164100/8436380.pdf
    • http://files.marianimediation.com/uploads/1/3/1/4/131406437/b7fec3857.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/goodrich_and_tamassia_algorithm_design_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/82234940873.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/54172558673.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/passive_design_strategies_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/kokovem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/fowowuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/27160936609.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/77428740422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/rita_pmp_exam_prep_8th_edition.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_off00005c7e.bin
b4378f61fda4687d34f9ba8bf43cd8caef75d3fd62a52a6c928bf3baf2095276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7E 5792 bytes
font_01_sfnt_off00007018.bin
8e4a237564195e1b2be0a779c3051b2166e9b4efb1101c9089998163cf0fc812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7018 10232 bytes
font_02_sfnt_off000092ec.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92EC 4324 bytes

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