Malicious PDF — malware analysis report

Static analysis result for SHA-256 9318d81d6188ef6c…

MALICIOUS

PDF

40.1 KB Created: 2020-09-01 12:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f73132a07f4690e975b7f157487cb8bd SHA-1: d9078695cd269f8504cebcf9d1bffa4f97bb9287 SHA-256: 9318d81d6188ef6cca9872ff556f40a8eafcd99905bd31265dacfd7aeef7ef94
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/wix?keyword=antiphonale+monastico+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be luring users through a deceptive document to a malicious redirector.

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=antiphonale+monastico+pdf
    • https://static.usrfiles.com/ugd/96768c_2ff8e5f24f5b4af3b4ab36d89fead804.pdf
    • https://static.usrfiles.com/ugd/b916f4_4770370656374fbb9ca23a83c49e5ce7.pdf
    • https://static.usrfiles.com/ugd/d99ef3_05adb4275f6a43eba0ab1cadbafe1431.pdf
    • https://static.usrfiles.com/ugd/493135_dd97fcc24df047669d4b179c0a162ac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2e05f65027e49acbad4d1839524116b.pdf
    • https://static.usrfiles.com/ugd/f63f29_57754231f1b241268c2f2ac0f24c5b71.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/calendario_mundial_2020_hora_colombiana.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/dasumowikolerisalugapoxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/lesikujipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/fafuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/ungrouped_frequency_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/kiduzujideroruverolugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/doyles_guide_family_law_barristers_sydney.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5098/files/badminton_rules_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0464/7210/2040/files/flamme_de_pyromancie_dark_souls_3.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2582/files/faruvagesakap.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_off00005295.bin
daf221c619df602ac4d553a4f98e5323c7987a60e31f0fcfb7597ffcffa1b875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5295 5076 bytes
font_01_sfnt_off000063a6.bin
f03695438ca947e81ba6c4ec2c2282d03403d7a971e33ca4e68e7ed1dac033c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A6 9864 bytes
font_02_sfnt_off0000856f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 4324 bytes

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