Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bf60b8cce8519c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 00:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3823df57ea66ac8ce690ee6a92cce4a SHA-1: 3d2c9202a7268b252583b3e2088d6124281e04dc SHA-256: 24bf60b8cce8519c71e7f3f0d1c078b6cae75ff5914bf6d0d603c19577efc647
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent URL, 'https://ttraff.ru/pify?keyword=google+docs+newsletter+templates+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and references 'Google docs newsletter templates free', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=google+docs+newsletter+templates+free
    • http://files.preservedsound.com/uploads/1/3/0/7/130776499/e0b2f33ca27.pdf
    • https://cdn.shopify.com/s/files/1/0438/9063/9016/files/osrs_fairytale_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/89167683873.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/4769090923.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/43349147313.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/48955304159.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/solange_cranes_in_the_sky.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.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_off00006342.bin
78f81ee44fcac3c79470d9279888b4f97fcc89c32b1d90816da146c672f6804d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6342 5596 bytes
font_01_sfnt_off0000764f.bin
96053dc7e7a126f232abb229b4be856727b3811bc82bd3c384f1f3c7c6664ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764F 10204 bytes

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