Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4550ecf742643b2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 13:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfa929af7b5b7e6888321ffba2744bdb SHA-1: f2858aabf87ba3409552af5d49406f7a9dfbb3b6 SHA-256: b4550ecf742643b2ad9e1de1814680d4e58927d916460115ac9863028236ebc3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) and potentially malicious content. The document body, though heavily obfuscated, contains a reference to 'themes app for android' and a URL that aligns with the heuristic findings. The presence of a link farm and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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.com/pify?keyword=themes+app+for+android
    • http://winas.recraftandrelic.com/uploads/1/3/0/7/130776255/vilumuzoke_topifejefuguve.pdf
    • https://cdn.shopify.com/s/files/1/0440/0054/2878/files/karezolirubakovawubawused.pdf
    • https://cdn.shopify.com/s/files/1/0437/3885/7623/files/bull_shoals_lake_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/tademuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/sanozomule.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/fundamentals_of_analog_and_digital_electronic_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/12696613630.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/51751908583.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/abu_dhabi_city_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/67341165111.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/sibojutelevujuwodixex.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/schermerhorn_management_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/lutemajiwekufo.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_off00006a64.bin
2fab87387233f81a79f2baf4e62e020f01633256f5a26b4b9793786737169fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 5200 bytes
font_01_sfnt_off00007be9.bin
d5ed2b13d7280d2edb21a79887a946e8f4677ea25d06607690c45d89d86cac78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE9 10312 bytes

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