Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f74e655ca8dcf6…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82972f6dc5ddc9e8a9e479414b92af67 SHA-1: f4329ef564ad9fafeaf3b0c897b91aaef6845ab3 SHA-256: c7f74e655ca8dcf60acfc4698e0ffd6eefd3a254144d4ec90490ea38976bacc7
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, https://ttraff.ru/pify?keyword=journal+carbohydrate+chemistry+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the intent is to redirect the user to malicious infrastructure under the guise of providing a scientific PDF.

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=journal+carbohydrate+chemistry+pdf
    • http://files.la-iphonerepair.com/uploads/1/3/0/7/130739780/6e97cb0cc627.pdf
    • http://files.kirstenangerbauer.com/uploads/1/3/1/0/131070030/buwat.pdf
    • http://files.capeclear-oileanchleire.com/uploads/1/3/1/4/131453034/9388a7e57c33d7f.pdf
    • http://gajof.ballicotech.com/uploads/1/3/2/7/132741555/f8788c.pdf
    • http://files.myurbanhermit.com/uploads/1/3/1/4/131437246/2814921.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/20423190183.pdf
    • https://cdn.shopify.com/s/files/1/0437/8135/7725/files/free_zentangle_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/crash_by_jerry_spinelli.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/94806282870.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/18792974454.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/skipping_bad_option_lastserver.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/goxagijumipuxenebuvemoxat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/22197630328.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/44357242264.pdf
    • https://cdn.shopify.com/s/files/1/0432/2227/0114/files/33566388693.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/tuderurirudoboti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/66671871885.pdf
    • https://cdn.shopify.com/s/files/1/0433/4537/9478/files/46664884730.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_off00006afa.bin
1172a2a67f42182974c1d9ab1d45e8c6f41e3d722cf018400ee2a72abb8b3719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFA 5628 bytes
font_01_sfnt_off00007df2.bin
cd29c788fa5cffeee32671b6d278f97bda0b1b970e30517f957061124d6b230f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 10536 bytes

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