Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbbcbd0867569e0…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 04:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54f3174ccc9c6aa22959ff55de57c206 SHA-1: b5c2670716dfe160988636d451a32300316dc324 SHA-256: bcbbcbd0867569e05dcdffc4aad65b51028dd80417d9f388bfa62e8516e00f53
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=inequality+questions+in+reasoning+with+answers'. The document body, though heavily obfuscated, contains this URL and other Shopify URLs, reinforcing the lure. The primary attack pattern is to trick users into clicking these links, leading them to malicious infrastructure.

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=inequality+questions+in+reasoning+with+answers
    • http://files.servicesgoglobal.com/uploads/1/3/1/3/131380467/4725000.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/60615352659.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/rufupopefavaxotulilod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/keledaroz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/95921189996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0111/files/fuxaxakaxagenuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/fibojanad.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/43367247704.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/bogaretusatosibafevirex.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_off000060a8.bin
c5fc69330546ea6f7e4a723710ed1e98f6eb36009729ed611a0b5d9d593bda74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 5204 bytes
font_01_sfnt_off00007265.bin
df0174c157d63108791e9a30a11063bfbfc82efdd66a14f96b7e2156380b39fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 15424 bytes

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