Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3f70b6427082ce…

MALICIOUS

PDF

38.3 KB Created: 2020-08-06 14:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b24fd0b2eaa05d79c94077e1edb67940 SHA-1: 2862d71a6f7e89c3923f76b10a69d0f5c3b700fb SHA-256: 9d3f70b6427082ce21eae1fea7471dc43cf985fca2f6871e8ec8f582e55d1da2
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, suggesting a link farm or SEO poisoning attack. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to educational materials to potentially lure unsuspecting users. The ML classifier also strongly indicated 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.ru/pify?keyword=alphabet+worksheets+esl+pdf
    • http://files.handbuiltvans.com/uploads/1/3/1/4/131453031/lukadafib.pdf
    • http://files.azzaziphoto.com/uploads/1/3/2/3/132302926/685807.pdf
    • http://files.honeyspringsfarm.net/uploads/1/3/0/8/130814874/wakakapovijino_naxabukatotawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/vejapoza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/wakewimukixumoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/jetefuwis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/97071243093.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/apprendre_le_franais_en_s_amusant.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/17664459763.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/62912909088.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/rivoposufewajixifedaferu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/wilkes_barre_direct_operations_center.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/50730507415.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/28312270167.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/xadad.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_off00005888.bin
b753e3abfb89543fdd01c9a6ae37f12f6f84c3815c1647c9fa4acbc13ee9a587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5888 5412 bytes
font_01_sfnt_off00006af3.bin
1c38dc0a5da2b20839f2560a77cca2527e37fea7d7a026dbaca14897efd88311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF3 9932 bytes

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