Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c810d5f3ac4e21…

MALICIOUS

PDF

40.1 KB Created: 2020-08-08 00:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0e8f19e3810a0249c53f6deabf84a0f SHA-1: 5a4fb9a1b792d0d5b8551a2d4d8c0444b8c58c42 SHA-256: 91c810d5f3ac4e212069c64b54d76cabb06c2c6a226bc2c8078ebf57970e74c0
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=architectural+design+brief+pdf.

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=architectural+design+brief+pdf
    • http://files.lifelonglearningpath.com/uploads/1/3/1/4/131410545/peturevimidux.pdf
    • http://files.rankingreys.org/uploads/1/3/2/6/132681740/tigoxivupemubaputugu.pdf
    • http://files.susanmccrae.com/uploads/1/3/2/7/132741348/wewovajune-xobav-bekazuwetitavu-tefaxuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/parinaniwotazelexefuper.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/cold_45_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/gused.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/convert_to_dwg_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/13521888126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/32332117789.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/99540587915.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/54979315922.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/bicolano_language.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_off00005ef5.bin
c7447069446fdcf461f97e3f5e02bcb46a67055ecd0c7101c67780dde70d3bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 5544 bytes
font_01_sfnt_off000071c5.bin
799692fa92b82248df6a4b3599e22c396116374bc118920c6e737efcf0f1da5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 9964 bytes

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