Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e74260e9f9a49fd…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 17:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a0694b049a6dc158af36ba14dc7ad7 SHA-1: 56f859d27d2953d8a056dab121db9bb565fa1973 SHA-256: 8e74260e9f9a49fdd17daae249d6203c6a1ca013b2696a3e510cfd2fef28a61c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=sample+student+autobiography+pdf', which is flagged as malicious. Additionally, a heuristic indicates a 'PDF SEO Link Farm' with many external PDF links, suggesting an attempt to distribute or redirect users to malicious content. The ML classifier also strongly indicates maliciousness.

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.cc/pify?keyword=sample+student+autobiography+pdf
    • http://files.anchorageonthestlucie.com/uploads/1/3/2/6/132682820/3820210.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/57592005584.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/greenhouse_effect_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/pap_hpv_testing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/cahiers_pour_l_analyse.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/62390547991.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7618/files/vakijoxufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/7735950842.pdf
    • https://cdn.shopify.com/s/files/1/0437/1067/7141/files/create_database_in_postgresql.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.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_off00005d65.bin
f6c14d195aa39bffc98590f7d4bdf1ab67a126f7527ad988861f11f2041b90e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D65 5800 bytes
font_01_sfnt_off000070f1.bin
6fe018519113dff3c897332ce864d90e77af5a218d2fd409a38e87576cb97e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F1 9932 bytes

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