Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4497d1bcf5b0c…

MALICIOUS

PDF

122.2 KB Created: 2020-08-06 01:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 952a4f55be61656794f8b44800b66374 SHA-1: c00d6ac66c3968427753c3d26c88ad1c817df935 SHA-256: fef4497d1bcf5b0c9bcbcd8466b4233db2c87f38001c7319095445a96ab615e2
120 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=steiner+waldorf+curriculum+pdf'. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The file was authored using wkhtmltopdf, a tool sometimes abused for generating malicious PDFs.

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=steiner+waldorf+curriculum+pdf
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdf
    • http://files.pirhozeta1920.com/uploads/1/3/1/3/131398385/tilosawa-dugutam-mogiwowipo-mekatogeduj.pdf
    • http://files.childsupportreformnow.com/uploads/1/3/0/7/130775350/wegulugepidije_pilavinamugeja_bezimubosinakoj.pdf
    • http://files.hypnosisworkz-sp.com/uploads/1/3/1/8/131856065/7724757.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/jugezidapanemuzeninodibur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/lopisixidominiwapozex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/50166301174.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/vesafelulanisus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/vakixuzogaxosiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/zamovajefipesawivi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/big_blue_bus_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/22530871449.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/megit.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/88939130089.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/11060141110.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178cf.bin
7ff79db78169098a4ffa33a2d4bfd02ef7c52798b48798c39bb8a3a30daa1185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178CF 9256 bytes
font_01_sfnt_off0001978c.bin
5591d93511fad41133ca0d6f1bd85f506fed5abbd8c19601874266eeb4975875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1978C 5200 bytes
font_02_sfnt_off0001a92b.bin
3430cefcd06902fdd30400c6adca5ec82f6bfc640208d1a5cf5f69e7a32a03f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92B 10420 bytes
font_03_sfnt_off0001ccc2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC2 4324 bytes

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