Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23b875cf220cc65…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 18:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e25d88eb74b1755f7ac1f3eed504dfbf SHA-1: 71b070c4d240814f4ef7ac7ec04a6d033d7d5d3c SHA-256: d23b875cf220cc65ee567b33b7f7c9aeac1fc4ea22917da99d6ef04a080a5c93
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicated maliciousness.

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.com/wix?keyword=man+in+the+mirror+vocal+sheet+music
    • https://static.usrfiles.com/ugd/c0fca2_81ab9fefb26f4bd799a6fa229fc1d357.pdf
    • https://static.usrfiles.com/ugd/b8c837_d786e40b2a564df98fcbab1ef2337c20.pdf
    • https://static.usrfiles.com/ugd/b8c837_12dbbae6700946b2bd35f5b8641ff41c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f712bf44f749ec92edee12670674e6.pdf
    • https://static.usrfiles.com/ugd/12f4eb_fdee34894e8b40ee8084787fd414ede4.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/92717298925.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/givanoluge.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/kahoot_song_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b5472a_5998ca0e0dcf4dc7af06101c61e01e84.pdf
    • https://static.usrfiles.com/ugd/409ca8_b986ed606db344028015fef6f4219f4f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/37677370652.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_off00005a15.bin
17a393cf5e422e66390480278e6e845ce020a305ed05510df8c8d84363a1ce14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 5104 bytes
font_01_sfnt_off00006b4b.bin
64f20bc6d97601e26655251fe6dd2632c45d7c01914d62a89646e6fbe59250cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4B 14864 bytes

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