Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9771f27c0e7318c…

MALICIOUS

PDF

36.4 KB Created: 2020-08-30 02:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df07d06b1dc1a6859c18c194fc1d83d SHA-1: a22bd178f7d15acdecde5e9856262000183547d4 SHA-256: f9771f27c0e7318cd54be4eaed7cae842d376ed4ae70c70a6202360a53b1add3
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'music box dancer sheet music free pdf' and the malicious URL https://ttraff.ru/wix?keyword=music+box+dancer+sheet+music+free+pdf, suggesting a lure for users seeking free sheet music. This link likely leads to further malicious content or phishing pages. No scripts were extracted from this sample.

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=music+box+dancer+sheet+music+free+pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/netbeans_for_php_development.pdf
    • https://cdn.shopify.com/s/files/1/0431/1544/6423/files/20596103759.pdf
    • https://cdn.shopify.com/s/files/1/0461/9485/1993/files/the_20_best_behavioral_interview_answers.pdf
    • https://static.usrfiles.com/ugd/565485_100e8ed4911140d38876a7232a399512.pdf
    • https://static.usrfiles.com/ugd/b8c837_89c355524e0a43f080341988eaf0d24b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2703d6f23054d5e99f2ec4970135d8d.pdf
    • https://static.usrfiles.com/ugd/912de2_824b009f4d714b4882a0fc295b6ce5ca.pdf
    • https://static.usrfiles.com/ugd/98857b_cfea132e762949868f294347a305f38c.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/jibojuwoduzerodexelonodad.pdf
    • https://cdn.shopify.com/s/files/1/0463/1009/7053/files/xubon.pdf
    • https://cdn.shopify.com/s/files/1/0450/6012/8931/files/antologia_de_cuentos_mexicanos_maria_del_carmen_millan.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/b8c837_204e3d82abd8400ea3720132253bfcbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d558f7d8314a43f29fd41b87880bd9e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5c39ae288aa48338b4977a89dcd2e02.pdf
    • https://static.usrfiles.com/ugd/b8c837_d14c48d4c1664a3da4a58274d6d36e87.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_off00004fd0.bin
b6f9056ff7f2b550345eb20a5543dd293c896d6b8c01975a4be47e2aa6e5d597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD0 5576 bytes
font_01_sfnt_off00006293.bin
a43d650f511607e97a0f9d6afd90a83d47e9788a87644bc8c68a8b1fb1288ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 9948 bytes

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