Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdfff22036f77c3…

MALICIOUS

PDF

268.6 KB Created: 2020-09-01 13:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf989ae985715a32dde559868769306b SHA-1: 6fc79437a0b36a9b576f03321472162fabdeb8e3 SHA-256: acdfff22036f77c369b00b8ea828682bd39358f730b83e407ad8aa23d2aae5f6
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.club, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains text related to "beta distribution examples and solutions pdf" and the malicious URL, suggesting a social engineering attempt to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • 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.
  • 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.club/wix?keyword=beta+distribution+examples+and+solutions+pdf
    • https://static.usrfiles.com/ugd/b8c837_13cec9d0f67f43a7acac605aaaaa5d1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_86b3e735cce247c796b4d063db64c3de.pdf
    • https://static.usrfiles.com/ugd/b8c837_02dd6ffa13a441a082f6696bee891411.pdf
    • https://static.usrfiles.com/ugd/b8c837_612b827bc8e34a2eb1d2979b865c90c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_396a42f591524d1b83156bef42351dca.pdf
    • https://static.usrfiles.com/ugd/735424_736528a56f854e48884479de2a216dd4.pdf
    • https://static.usrfiles.com/ugd/34e21e_e101085f014d43e696400770cce60731.pdf
    • https://static.usrfiles.com/ugd/b8c837_7900aad78a7248fb8090deac27da0b7c.pdf
    • https://static.usrfiles.com/ugd/de65f7_21755499aa81425f80896c5e9e0ed4a7.pdf
    • https://static.usrfiles.com/ugd/6df952_ac00a2d6413c4cee981c955c1c7ddadf.pdf
    • https://static.usrfiles.com/ugd/aa14a9_ab8f4135700b408cb1f2c6ec991efc2c.pdf
    • https://static.usrfiles.com/ugd/451a43_e55ccc1a5f6d4de19be810341feeb3ee.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003bd47.bin
070296a82301c523e71a53c8ebb7cf6acafa478ca3aedcf8932a4f4124015ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD47 5444 bytes
font_01_sfnt_off0003cfb3.bin
6c19db324bbb251539007bfaae46de32bc34e414ea71092045706d5eaa94e008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3CFB3 19996 bytes
font_02_sfnt_off00040eb0.bin
8b8f6860390b4328def25a80df74333875abd17e34441a588af4ec8b2c14d6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40EB0 16384 bytes

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