Malicious PDF — malware analysis report

Static analysis result for SHA-256 c233d0b2eac72dbb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 19:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4395d3402ac697879c1c1e9a821cd25f SHA-1: c80ea369e54ef78923397ac14c3499df8c3b4a3b SHA-256: c233d0b2eac72dbb956e78ad9a71d92f5c70dc3bc2f0a17856fb9885dca7d34f
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to 'demonstrative pronouns worksheet pdf grade 2' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a link farm heuristic further indicates an attempt to distribute malicious content.

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=demonstrative+pronouns+worksheet+pdf+grade+2
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/perexus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/japanese_architecture_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/jinugizezanadarim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/binary_coded_decimal.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/81527752090.pdf
    • https://cdn.shopify.com/s/files/1/0447/0764/3545/files/bosch_automotive_handbook_free_download.pdf
    • https://static.usrfiles.com/ugd/760101_daa91ba8e9a84c67bf5474e5e944e1ca.pdf
    • https://static.usrfiles.com/ugd/868401_3d6beaf0b471468a8d21d05c3c8e4731.pdf
    • https://static.usrfiles.com/ugd/60933b_46652eeb366a4dffa7e10d7ba024adb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_38cd90dd58504d1fadfffde7be757e50.pdf
    • https://static.usrfiles.com/ugd/33a16d_d28291c36958434d846724e6541107f1.pdf
    • https://static.usrfiles.com/ugd/ace02d_3539618fa1064696b09d30c05556b6bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6263b47bbb844538963b7dc5bdffd8f1.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_off00005cde.bin
fa4463444210bec552dbdcca609e1f5c3080865be6e5d0226aaff75d58c8792d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDE 5768 bytes
font_01_sfnt_off00007081.bin
444aa65b936344f2315cd307ffac18bee4e67610b285157bc9128275737da401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 10312 bytes

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