Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d6c807c3766d2f…

MALICIOUS

PDF

84.4 KB Created: 2020-09-20 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eeb9df146b6536f7727395daf08d91e SHA-1: 45f177b37b15d696479042b6b3cd45cb32eed4a7 SHA-256: 98d6c807c3766d2f9988f92ce476ad5d8fea1eb085a050807c0f6bda2c5bd220
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. One of the embedded URLs, 'https://ttraff.cc/wix?keyword=bill+van+patten', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, reinforcing its role in the attack.

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.cc/wix?keyword=bill+van+patten
    • https://35c9f779-d74c-4390-87bd-df59e026090f.filesusr.com/ugd/9757e7_f577eadd39f5487fb261e217dbc39ec4.pdf?index=true
    • https://d1463814-e7c1-427b-9d40-d876c1c6be0b.filesusr.com/ugd/3bf302_c94733dd22564907b287d0e3bf7f0346.pdf?index=true
    • https://067b5a80-b0dc-49ef-9cfd-f7fa2547557c.filesusr.com/ugd/e948c1_a602e33c8ccf49c6a35c94f0b0f0bbbe.pdf?index=true
    • https://8ccdc6e5-1ccc-439a-a5b3-93e28a679ab6.filesusr.com/ugd/f99735_99f82e092570453f8e9093f3ceb87a2c.pdf?index=true
    • https://b78b2862-41b5-41f3-a119-547afeb7d869.filesusr.com/ugd/76b6de_05d9cdec4e3945c1aaf8b1baa50ffacb.pdf?index=true
    • https://f3095329-4b91-4576-93a1-7d416b0e90ea.filesusr.com/ugd/9d24cb_963fed62829a43e8acd36e44cd32984e.pdf?index=true
    • https://9634db1d-79c9-4261-8ee7-8fadbe8ba5f2.filesusr.com/ugd/5e8de6_8c4e6021949e45e3a4c1deaf9a46ff88.pdf?index=true
    • https://bf85e75e-9dca-463a-bb1d-428f3204f2a4.filesusr.com/ugd/067ecb_304d367c6c7c4a45a7471b70642909e9.pdf?index=true
    • https://8ebec985-4126-4064-8416-e1d939e91420.filesusr.com/ugd/cbdbb6_a9d855ca717b4db2bfc8f13c6da03af3.pdf?index=true
    • https://af2a392e-5b99-4601-9af0-4c95693b0463.filesusr.com/ugd/f55bec_244f2bb77eee4003911a5ed7671d584a.pdf?index=true
    • https://5dd26f20-a25d-4b81-a370-47970103b375.filesusr.com/ugd/5be868_11c02021dcfb48adbcb4b323ea076768.pdf?index=true
    • https://2485f329-e60e-435e-a140-5932ff931fb7.filesusr.com/ugd/724bd4_cebc5a7233664ef896e5b1161fa0e620.pdf?index=true
    • https://82245b49-c16b-4634-8bd2-b0b680a9875c.filesusr.com/ugd/f8de3e_3dd7af8191bd4e7baff0d6fbb0885f8c.pdf?index=true
    • https://da4e0a39-2233-4cb7-a39d-578331bdc820.filesusr.com/ugd/e2c6c1_b2faeae66fac4e57b04db3324536808c.pdf?index=true
    • https://34e94406-ec26-4f53-b024-720f86bf9be8.filesusr.com/ugd/a467d2_42e5ec09291d4b81ba4ca4adcb877e78.pdf?index=true
    • 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_off0001108c.bin
d1908e6e90c289e465a1d31d679efd9d3223aaa7f9f2194f67e7216b4ca51522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 4648 bytes
font_01_sfnt_off00012079.bin
cffda48370344dd432fe9e8eb60a5461cd5001ff6a8af5995d1060047e36070d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 10680 bytes

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