Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8876cc174b6e066…

MALICIOUS

PDF

35.5 KB Created: 2020-08-30 21:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8589746a3f079de002a2f4e5874026 SHA-1: 290e353af904d6baa072ecca0facb2ed28c49676 SHA-256: e8876cc174b6e06650a48833f4b6f96fe2761ffe83ad7c688666ef021354cb4e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at https://ttraff.ru/wix?keyword=beadwork+magazine+pdf. The document body and embedded links suggest a lure to download further content, likely malicious. The ML classifier strongly supports the malicious verdict.

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=beadwork+magazine+pdf
    • https://cdn.shopify.com/s/files/1/0429/0894/2499/files/70497648241.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/76402893462.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/kendo_datasource_group_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/remure.pdf
    • https://cdn.shopify.com/s/files/1/0432/4851/7275/files/cvs_blood_pressure_monitor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/bed_box_springs_vs_platform.pdf
    • https://cdn.shopify.com/s/files/1/0433/1601/9355/files/good_faith_marriage_affidavit_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/95395915015.pdf
    • https://static.usrfiles.com/ugd/48d9a1_fa376ac0ab6c4bee8452d6e19d4f1f6e.pdf
    • https://static.usrfiles.com/ugd/739437_16b3e12a5885466fb97f485c8f21fdc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e219497cafd84df0b95eed4f89dc739b.pdf
    • https://static.usrfiles.com/ugd/b8c837_29b0faa7fe7f46a59861ac64290e4320.pdf
    • https://static.usrfiles.com/ugd/ac72e0_f2cc38f5700c46dbbec10b4f5c482c6c.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/maths_practice_book_for_class_5.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/62903259999.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_off00004d73.bin
502245f5ae8a015cda363218ef9bfdb03e1fced30453164b229121672588fed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D73 5408 bytes
font_01_sfnt_off00005fea.bin
a5b4f547d9d472b7a4b2342dac0dfbe9897738936c98c7314ef7f48da96c5e52
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 9896 bytes