Malicious PDF — malware analysis report

Static analysis result for SHA-256 3befc1d9979b8be7…

MALICIOUS

PDF

57.2 KB Created: 2020-08-19 07:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae89a432d40382f7dfdee8c1fdadc79c SHA-1: 2a3425267334b463ab13be13dae8ff9b57a9f718 SHA-256: 3befc1d9979b8be7d2bda7cd8ca70ece77db1228c49548ea5c44e13e07fef1b9
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=kala+bazar+film+songs+free`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites under the guise of providing content related to 'Kala bazar film songs free'. The ML classifier strongly supports the malicious nature of this 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=kala+bazar+film+songs+free
    • http://files.40bandit.com/uploads/1/3/1/4/131453904/cbafd4b74ef5.pdf
    • http://files.sailingkenutu.com/uploads/1/3/2/8/132814674/xokupalipokow_jikojozuxadaxu_ragamaragiwi_nuneverebex.pdf
    • http://files.afrocamming.com/uploads/1/3/2/7/132740637/0056564b83c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/73540247192.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/ohio_apostille_request_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/xamuminubagegowi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/kiwefukasubanazexodagigix.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2382/files/rexunasovujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/38275442709.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/golujebudifujolunosetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/wevisusagorifalelenewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/69945988226.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/2020_calendar_august.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/jurisprudence_law_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/4002/9344/files/kisobor.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6142/files/87468743048.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_off00009991.bin
47a97f1fdc6a5a29b00bf6bc7dc4bd72e884015f8cc6809e82da890587d40953
pdf-font-stream PDF embedded font (sfnt) at offset 0x9991 5244 bytes
font_01_sfnt_off0000ab5e.bin
06a4325eb03b1e0f86401092ec6da0142ef02edfa2365099dacbf250cb8a395a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5E 14360 bytes