Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cf70bbb91de771…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 06:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bf70884a4af5f918cb18d388ff3e63f SHA-1: 930661e56c2bccc64024dfbd172ab44a73663359 SHA-256: e5cf70bbb91de771955f7649fa478734aae7420eab453319e710b35f37fa178d
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=board+size+guide, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Board size guide' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link farm. The presence of numerous Shopify URLs, while some are benign, contributes to the overall link farm characteristic.

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=board+size+guide
    • http://files.vwisdwy.org/uploads/1/3/0/7/130775506/7a0a3eec654.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/docker_compose_version_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/advanced_plant_systematics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/5811932963.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/australian_passport_renewal_form_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/90574252755.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/tawewogizixubikazek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/zekemotajupifijixefetej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/54103866644.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/54095542580.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_off0000686f.bin
11d816fc493b2188582bc80f30dabf3efef31751f82f1be70a82e83bb4cbde6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686F 5060 bytes
font_01_sfnt_off000079bb.bin
2cf8db1b6e6e05c0927291c32ea9563464b85db6a9133e307084bd99c5268154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BB 10132 bytes

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