Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e79eda8d975b1f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 16:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 814f7d9c01b9d5aed86b148bc0e00011 SHA-1: 0d97b21b76067fe93dc432b17bd0259d49b9affb SHA-256: 48e79eda8d975b1fecf80543ec30e1804b5f67db052c13f1bbdd1dd7598a1a1d
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 destination and potentially deliver a malicious payload. The document body, though heavily obfuscated, contains text related to worksheets and URLs, reinforcing the lure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content widely.

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=binary+division+worksheet+with+answers+pdf
    • https://static.usrfiles.com/ugd/238140_c03835010c8b407f9e25da3dd348da3e.pdf
    • https://static.usrfiles.com/ugd/3fc21f_2bcdfe1f0e274e4d8d0223c515d51a4b.pdf
    • https://static.usrfiles.com/ugd/865d50_bdd16ce344294540b957236fbac01664.pdf
    • https://static.usrfiles.com/ugd/b8c837_0990046c9ea74b949eaad5d8f831e0b0.pdf
    • https://static.usrfiles.com/ugd/289c5e_42afaa7db9e74963875b9cfbf7db9430.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/michelin_guide_california_2019_bib_gourmands.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/54064488579.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/ketapadowuxitazefukavame.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/analog_and_digital_sound.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://static.usrfiles.com/ugd/b8c837_2832e418af6d455aae9d5866b4f4d745.pdf
    • https://static.usrfiles.com/ugd/b972d5_13801ed8a75c41798a78b88c0237cc11.pdf
    • https://static.usrfiles.com/ugd/e5a943_6cf5e6fb0ace455985e97674dc04d7f8.pdf
    • https://static.usrfiles.com/ugd/39cb9d_615b79cd95554216a34f8fe01296b23c.pdf
    • https://static.usrfiles.com/ugd/76de1a_5fc408025a74415288efe1d11f3b540f.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_off00006066.bin
cf8237edf3d6a88aeb82e24fcb22d5ab79d612a540371b0e0f30e0f5aa2beefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6066 5464 bytes
font_01_sfnt_off0000731c.bin
61b3115b2d2516a4e7731608f6910d94888e9aa29da0ad7103139745f6300466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731C 10592 bytes

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