Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca255a796582a682…

MALICIOUS

PDF

135.8 KB Created: 2020-08-10 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a2f5b2581389cab57de59796d69ce4 SHA-1: e826b2e3f9eeef3479d68f51141f3e78d2ff82d6 SHA-256: ca255a796582a68224ad2df4088f0d32b0d0e98a4061de110db2fa2cbe564731
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=icao+annex_14_aerodromes_volume_1_pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, while many are benign Shopify links, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=icao+annex+14+aerodromes+volume+1+pdf
    • http://files.citygroves.com/uploads/1/3/0/7/130739601/tapet.pdf
    • http://files.mariedyerstudios.com/uploads/1/3/2/3/132303082/3000020.pdf
    • http://files.cascadiacenterformassage.com/uploads/1/3/0/8/130815303/jorudilade.pdf
    • http://files.bamabreddoodles.net/uploads/1/3/0/8/130874691/pagojovigarurem.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/31666993957.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/financial_reporting_ca_final_books.pdf
    • https://cdn.shopify.com/s/files/1/0447/1622/8761/files/absorption_costing_vs_activity_based_costing.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/finekefoluwutilugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/mulipofeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/99826823857.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/75731325913.pdf
    • https://cdn.shopify.com/s/files/1/0432/4078/4035/files/robilidivimufezil.pdf
    • https://cdn.shopify.com/s/files/1/0440/6060/6616/files/44745132685.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/16196461856.pdf
    • https://cdn.shopify.com/s/files/1/0434/0436/1895/files/73251387336.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.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_off0001c607.bin
49e339d69f21d2a3844297f68a9022aa966637a65af5c6bf6da666df82c09884
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C607 5504 bytes
font_01_sfnt_off0001d8c5.bin
a084473a1b128f9c54ebcd81f6e0107ff52dbfa8488036649e5c9b8b9f1ef572
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C5 10444 bytes
font_02_sfnt_off0001fc6f.bin
23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC6F 16112 bytes