Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d659aa63cb1ce9…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 16:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84de3951bca93bd01516c601cd4d2141 SHA-1: d0f5d7919665c348add2cd09448413db48f21cf2 SHA-256: 24d659aa63cb1ce97fca1bf6055fc43f98ca35fdc3931e2fe1aecb846c53a504
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL and references an 'Ielts essential guide'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The primary attack vector is likely social engineering, using a seemingly relevant document to trick users into clicking the malicious link.

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/wix?keyword=ielts+essential+guide+british+counci
    • https://cdn.shopify.com/s/files/1/0438/3077/1869/files/vufupojune.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/46643708224.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/network_bandwidth_monitor_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4983/files/lavezixamufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/tebafuwimexakanuxipage.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/refesipumalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2199/1079/files/reasons_for_becoming_an_entrepreneur.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/67657887310.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/siliwuxevedovori.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/79471740403.pdf
    • https://static.usrfiles.com/ugd/74c34a_a22dcd7420654a0e96c4aa0e601ff4b4.pdf
    • https://static.usrfiles.com/ugd/e8506d_41d413706d294eb48d40d74a4dfdebbd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005362.bin
82e06093ef4576e1ce2c5864a7ba26097480f315e511820c5570426fa3cb3194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5362 5160 bytes
font_01_sfnt_off000064d2.bin
6cf9a433ffc78a290ae516ff4b094fb82163252885e6c71c23db919361eac3ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 10104 bytes
font_02_sfnt_off0000876c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 4324 bytes

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