Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bba3895597ac7a3…

MALICIOUS

PDF

44.1 KB Created: 2020-08-16 00:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f098e331efb32dfcdc5f3e8a2b933f5 SHA-1: e7d5598ebc9fbf32d9aefe9e9e8a5f42edb6ab14 SHA-256: 3bba3895597ac7a3d19fc863020c999036e6d2127f7bba82974d16e14dfe6189
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL related to 'us f1 visa interview questions and answers'. This link, 'https://ttraff.ru/pify?keyword=us+f1+visa+interview+questions+and+answers', is the primary indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, likely an attempt to obscure the malicious redirector or distribute further malicious content. No scripts were extracted from this sample.

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=us+f1+visa+interview+questions+and+answers
    • http://files.tonguetiepractitionerinkent.com/uploads/1/3/1/0/131070151/takibonusodexuxore.pdf
    • http://files.iridescentideas.com/uploads/1/3/0/7/130776206/vunovapux.pdf
    • http://zujil.jracsummerswim.org/uploads/1/3/2/7/132740541/30e209ccda578ef.pdf
    • http://gozino.micheleaikin.com/uploads/1/3/0/7/130776078/e4545f00415e9.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/32740472810.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/lifokexusilege.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/78423540195.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5899/files/texas_advance_directive.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/46220273441.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/wibubuka.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/turadowupusupokunibip.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/61934601788.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/1128074448.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_off00006f7d.bin
f19a8ba9e1090ea6f0017f48e03f0f62fef8c1895ff62128fdee40569bd13158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7D 5188 bytes
font_01_sfnt_off0000814e.bin
c4e90c8bc4c2f5d4fddf7489012e90d9c7edeabcb932e24cf4da928e074d427b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814E 10028 bytes

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