Malicious PDF — malware analysis report

Static analysis result for SHA-256 455fa56ed6fc0c3a…

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 04:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99fd93426e45bafde3c3fd06ad841dc7 SHA-1: c4a4a43bf7c3d9033ee861c1b4d5be028a19fff0 SHA-256: 455fa56ed6fc0c3ac77c97018d7215c37909762ec19f1ad4d1595e5e47ffd7a9
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=the+crystal+bible+free'. Additionally, another critical heuristic indicates a PDF link farm, with the first URL being 'https://static.usrfiles.com/ugd/405339_b3106722545348558d4b2d92f6968df0.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the aforementioned URLs.

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/wix?keyword=the+crystal+bible+free
    • https://static.usrfiles.com/ugd/405339_b3106722545348558d4b2d92f6968df0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb822ae299e434eb3b96f0240690738.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d831fe530bc41d4924961f6fe0daa58.pdf
    • https://static.usrfiles.com/ugd/eed56f_b06f7d0961074d4e93bc1069942d03f2.pdf
    • https://static.usrfiles.com/ugd/41f880_d0be9692e86a44528ada732d34a53174.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/cambridge_checkpoint_mathematics_coursebook_7_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/veget.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/cheerleader_uniform_sims_4_cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab918a06946b4d48873b31213d183f3a.pdf
    • https://static.usrfiles.com/ugd/6cf392_b9356ba8822e45f5940e32cfcae65273.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ab7.bin
e1485d12e4996c8525e104dd4b865f054447fddea5cac48537bd8a57862dd29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB7 4732 bytes
font_01_sfnt_off00005ade.bin
929728a7b2c55c1d251a9e9c48ee7f666f1277681845d2d64511438a334f11fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADE 9732 bytes
font_02_sfnt_off00007c23.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 4324 bytes

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