Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d2023886de4750…

MALICIOUS

PDF

35.7 KB Created: 2020-09-01 18:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca54f72e9f236f1c6faca129cee320be SHA-1: 5af3f73b9a1be16b16e98f4c0fdc4d692ace3bfa SHA-256: 56d2023886de4750c0b506bf0e881453d7e942e07fb5f1276c681f45d62dd940
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links suggests a link farm, a common tactic for SEO manipulation or distributing 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.ru/wix?keyword=attagasam+movie+songs++in+starmusiq
    • https://static.usrfiles.com/ugd/97634b_485e1321481d4e6bada0ff0414cb65de.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cba53c8fb9c404482634ad67dad745b.pdf
    • https://static.usrfiles.com/ugd/538d67_83ec0b578e924299bc316bb7d53cf1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7b8fe502414435caf3b819606886c9e.pdf
    • https://static.usrfiles.com/ugd/29c71c_9021f131e8774c04a2a1cfcb354c9b92.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/marcelo_marmelo_martelo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/jeniwepatupubebafamovu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/bagitaviwobapekevonipod.pdf
    • https://cdn.shopify.com/s/files/1/0462/4475/7664/files/video_bts_idol_dance_practice_metrolagu.pdf
    • https://cdn.shopify.com/s/files/1/0465/1361/9094/files/rolozogowola.pdf
    • https://static.usrfiles.com/ugd/5899d5_919b5b0299694d77b2d1be064a6ec05c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f73c7d0a84141f9b3453a32242d03eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ebb990a82c140de998cf1f85cacf811.pdf
    • https://static.usrfiles.com/ugd/469aea_a314ed670c494184892534bf66abaa13.pdf
    • https://cdn.shopify.com/s/files/1/0428/6749/0972/files/genel_matematik_1_murat_gzelte.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/mikuroforogazenuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/sears_kenmore_elite_dishwasher.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e05.bin
007557fc8776b9e56798f5a90ad8465d1573dcf4c48f4cb9a31663ccb8e9bd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E05 5148 bytes
font_01_sfnt_off00005f7c.bin
db0fe6c9ef3e776bb98dde1685d7c3f31e5ce7dd272de8794a3b2f7505222f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 10108 bytes

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