Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1df499d5d598086…

MALICIOUS

PDF

45.2 KB Created: 2020-07-26 21:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c0a9c334f828586bb49c64e300b719 SHA-1: a044c20cef18f80ac44d843af0c610959cac1709 SHA-256: e1df499d5d598086c2ae1403d009b3e7d0bf1e19fc2044ad5d2a2c2fe6a4e022
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'casing design theory and practice pdf'. The presence of multiple external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or traffic. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=casing+design+theory+and+practice+pdf
    • http://files.northmoruyasolarfarm.com.au/uploads/1/3/1/4/131409463/nimimax-tigek-rokejelemi-jajolafagukojet.pdf
    • http://files.perfectoclean.net/uploads/1/3/0/7/130739263/9996016.pdf
    • http://files.kvag.net/uploads/1/3/0/7/130776346/3184610.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/28310415233.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/78161148909.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/zemebijikurigokulozuvezog.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/86892700444.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/96064087141.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/simanowoxevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/14770279379.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/ditugufukakukexezixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/defawigopixiwenodudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/59166744871.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_off00007357.bin
b864a1d94a37b0375713f4216de9c3282885342ce13ff803f51dab66af7c5439
pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 5300 bytes
font_01_sfnt_off0000855a.bin
b9e472d4cc7aa377fa3438c76024563c0b69b845303366fc4b0f8285588c3c97
pdf-font-stream PDF embedded font (sfnt) at offset 0x855A 10000 bytes