Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d63b6d47ed6d1…

MALICIOUS

PDF

46.6 KB Created: 2020-09-11 08:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025c46fcde22b4ec51f3cdfd924a87ff SHA-1: 0f2a33de042763071683e06300b422f51cc61b39 SHA-256: 937d63b6d47ed6d13fbc90e3b6f561b064a2e7e9797f8cba6dda19897f1c9558
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. This redirector, found at https://ttraff.ru/pify?keyword=msi+afterburner+new+version, is designed to lure the user to download further malicious content. The presence of a large number of external PDF links, many pointing to potentially malicious infrastructure, further supports the malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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/pify?keyword=msi+afterburner+new+version
    • http://files.asa-dc.org/uploads/1/3/1/4/131437306/21f468be24ed0e.pdf
    • http://xitiri.raveim.org/uploads/1/3/0/7/130739139/1196066.pdf
    • http://files.bloomwildrose.ca/uploads/1/3/0/7/130775197/laxezese.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/windows_10_free_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/bionaire_tower_humidifier_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/kezuzesez.pdf
    • https://cdn.shopify.com/s/files/1/0451/0420/1893/files/23325376921.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/celta_assignment_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/97507827705.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/3753315534.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/free_picture_coordinate_graphing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/11313216235.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_off0000797c.bin
099affcac186b887cc71b662607812ab620c89bd0e884b5b2303f5fc73af1d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 5024 bytes
font_01_sfnt_off00008acd.bin
53e5bc1569949f450507f8b05afd473c994415aa7f4101e001210f00456e7168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACD 10136 bytes

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