Malicious PDF — malware analysis report

Static analysis result for SHA-256 9037fcf62147d961…

MALICIOUS

PDF

40.4 KB Created: 2020-08-03 10:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a1dcdb0b182a8177a558572a021fe7 SHA-1: d82a580da37cc9f7565381ac80c0c3468b082802 SHA-256: 9037fcf62147d961df2937924493e8d7cabc072147b053473ace802bf112ce4d
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a compiler design book download. The link redirects to `https://ttraff.cc/wb?keyword=compiler%20design%20book%20ullman%20pdf`, which is flagged as malicious. The document also contains a large number of external PDF links, many hosted on `cdn.shopify.com`, suggesting a link farm or SEO poisoning tactic to distribute the malicious URL. No scripts were extracted, and the document body is heavily obfuscated.

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.cc/wb?keyword=compiler%20design%20book%20ullman%20pdf
    • http://files.beyondtolerancewichita.org/uploads/1/3/2/3/132303338/be610c62aef02eb.pdf
    • http://files.episcopalclaycenter.org/uploads/1/3/2/6/132695535/mewexukiwu.pdf
    • http://files.vanfiretrust.org/uploads/1/3/1/0/131071297/70af7836.pdf
    • http://files.sukhi.no/uploads/1/3/1/1/131164442/5461426.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/32303279360.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4096/files/49058802289.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/gisumosep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/paluzig.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/77472689840.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/2923335228.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/30976338067.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/vinyl_world_651.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/mudupuxugazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/pereb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/mortal_kombat_2_moves.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/74009766616.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/ramerelevekepuxof.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_off00005e6a.bin
1c809d6e0faf010d40ec513ca2850296de3ca3b821139b537fefe7ff25d988b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6A 5472 bytes
font_01_sfnt_off000070e6.bin
700c0e934bd6addbf58235f6a3653a90b33566bae7450ba5c8d42f020e999b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E6 10472 bytes

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