Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0872fb0e33355da…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 16:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5357e3d9e4db2690d53ffbe04527463 SHA-1: e4a0310ce0f3d5a58e62c1aa89051a5b93547e78 SHA-256: d0872fb0e33355da8eb7eba3ed17f4dccd9d0f6e019a2d0360e67ccacbf03038
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this is a PDF link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was unreadable.

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=boostrix+vis+pdf
    • http://files.halifaxstreetangels.org/uploads/1/3/1/0/131070579/1662198.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/16974444152.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/zelisovareve.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/93631084427.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/kusefotuxalenerememo.pdf
    • https://cdn.shopify.com/s/files/1/0444/3671/7735/files/57637044718.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/maluzetolapuxizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9280/files/css_rounded_corners.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/25927348371.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/95966346719.pdf
    • https://cdn.shopify.com/s/files/1/0434/5007/3240/files/associer_plusieurs_en_1.pdf
    • https://medlineplus.gov/languages/tetanusdiphtheriaandpertussisvaccines.html
    • 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_off00005861.bin
6a0d3896da0c505286c44a46937050a2130c38dac94d328e3f77d4153335467b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5861 4968 bytes
font_01_sfnt_off00006969.bin
3a0c1ef331e04671aeec55e99ef555bfe9dde84b4e210412ac641a4cef90087c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6969 10120 bytes

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