Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1918f2749cf27e…

MALICIOUS

PDF

80.6 KB Created: 2020-08-19 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 168ae1042b1f2cf1bace69a3a54be925 SHA-1: 2929cd15435b22cd611c798f977dbb98d138f8ad SHA-256: 1c1918f2749cf27e032e9548ccbc99cf0f56f0450f5966c8ea71f10aa5294b2e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, with one pointing to a Shopify domain. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=histoire+du+cambodge+pdf', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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/pify?keyword=histoire+du+cambodge+pdf
    • http://nagalaleb.rnrinc.org/uploads/1/3/1/1/131164573/5302320.pdf
    • https://cdn.shopify.com/s/files/1/0434/8647/8489/files/cefaclor_500_bula.pdf
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/37844778936.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/57923908619.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/83578810495.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/muletokamalaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/lisojebawugipok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/nulumuwewusip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/wulazuriv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/97384864443.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/64241618534.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_off0000f9ed.bin
1cbfcefa186f964cc95ed7878f59c6f755e4e57c1148b90c694c822bef477331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 5544 bytes
font_01_sfnt_off00010ca5.bin
4b0cc6df15b2e932d9033f13d2edf4e0f8f236b0884636dbdc00c01588969f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 12668 bytes

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