Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89f158c4c351524…

MALICIOUS

PDF

50.6 KB Created: 2020-08-31 01:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef2553cd83f7b0c814bc7eda4af8f5da SHA-1: 72a2983c85525b21b5d82228034c6c439fc83e7e SHA-256: c89f158c4c35152456196f7a7207b09e0a28bbb4d0eb4e26796e3efcae3448bc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=qualitative+test+for+salivary+amylase', is identified as a malicious redirector. The presence of numerous links, including one to a known malicious domain, suggests an attempt to lure the user to a harmful external resource, likely for phishing or malware delivery.

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=qualitative+test+for+salivary+amylase
    • https://cdn.shopify.com/s/files/1/0462/0058/6398/files/letter_template_for_proof_of_residency.pdf
    • https://cdn.shopify.com/s/files/1/0436/9698/0136/files/75485003894.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/naleduzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/abnormal_psychology_barlow.pdf
    • https://static.usrfiles.com/ugd/b5472a_67b7384844704ce5847cb6b6d3e88431.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://static.usrfiles.com/ugd/314c35_1418a2149256464c83f2aa50d40bf458.pdf
    • https://static.usrfiles.com/ugd/739437_bf2e9132c5cc41e890ba75217d08e621.pdf
    • https://static.usrfiles.com/ugd/b8c837_50302e195d97412e80bf43dd01a2dd3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_39e4fce23e094c38b95c59222cf2cbd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb6fca7f18444a6a859001c0166b6698.pdf
    • https://static.usrfiles.com/ugd/95089d_55c99909611a4d4d8f51b83a44c511be.pdf
    • https://static.usrfiles.com/ugd/b8c837_20bf0c9171154a18bdc394bd83543d88.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d13cc2996bd498fb9257481880a5ee6.pdf
    • https://static.usrfiles.com/ugd/b8c837_10d67812611b4847826248b5193855b4.pdf
    • https://static.usrfiles.com/ugd/565485_3495c7633fa3465cb9b4d0277548ca91.pdf
    • https://static.usrfiles.com/ugd/b8c837_efecfac215454b0e9be89bf658fd3c9b.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_off000087a0.bin
45fb28cdf096c784d6fec866c81f23b64fabdd38581cb2d3bdc5a6dad962f608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A0 5136 bytes
font_01_sfnt_off00009911.bin
0480efad705c6c63e1e302999bc905f7860aeafafbaf5f34870f83425990e780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9911 11060 bytes

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