Malicious PDF — malware analysis report

Static analysis result for SHA-256 b159fe683f8c56e4…

MALICIOUS

PDF

33.0 KB Created: 2020-08-28 23:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab8ff64fab8ba44cbae7765d0e579e0 SHA-1: 5999519b2d6f0c66909f8349e1408e79a7f6888a SHA-256: b159fe683f8c56e4b2315d060fc12d428691141ae9d1a98d649fcf6a838c418e
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to "piano sheet music" and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links were generated, likely for SEO poisoning to attract victims.

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=the+bare+necessities+piano+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_2a5aa4b91117444d966558782b815cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_79205009721042c7a088d05b4efaf80a.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f05633342643548e1a060c9763ae51.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d3cc17852454d7e8de1d08a46563404.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f09e834ede14f4287359d0c1aa2bbd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_23fd4484a92a4616b0e93462d91a9c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_88337e4664b04b30ac83f69ffabd745e.pdf
    • https://static.usrfiles.com/ugd/b8c837_439bb322d2284741ae73232b0a5f10b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b12ea54676b4fd69226921cd694a7aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7746/0383/files/cue_club_full_game_free_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/zisofafilasawemiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/3282/9342/files/83997825341.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af2958918294897a28c4037d4c9908c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a422e836c42a4d85b8a812df5422cc6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b288ac6bcf0459cb27a8fc8b7ab4637.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9e377371a5b4457b6a196d957fd3a1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d41640d3c184fca8f35edf71921ecee.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_off0000452e.bin
75113a600144a57db8442823e6493e253f8df322c0e20ca9667cea2f0b582719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x452E 5232 bytes
font_01_sfnt_off000056c2.bin
9067c09753a6037d7dfb60e22ec356d5cdf6c49438e6dd2e51054ff4b92e27b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C2 9400 bytes

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