Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b4b6d69b11b25d…

MALICIOUS

PDF

48.1 KB Created: 2020-08-30 18:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90bfdda31b3bd7d3a1844b6b8ad46891 SHA-1: 8c089e7a9a8c8212eea89ae209ebb680031bb488 SHA-256: a3b4b6d69b11b25db57a00ac2966c0dfcb4782532c033b5ac6f85f0e53889856
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, disguised as a GMAT question bank. The document body, though heavily obfuscated, contains the same URL and references to GMAT sentence correction, reinforcing the lure. The PDF also contains a link farm with numerous external PDF links, many hosted on cdn.shopify.com, suggesting a tactic to obscure the malicious redirector or to appear as a legitimate resource. The primary malicious IOC is the redirector URL.

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=sentence+correction+gmat+question+bank
    • https://static.usrfiles.com/ugd/a382ee_e3c356f591ab427b9066f37ffabaa816.pdf
    • https://static.usrfiles.com/ugd/89363e_5d801e09c8524ebfa5ccd63d2c982b5f.pdf
    • https://static.usrfiles.com/ugd/599026_4c1136bf3f964f28b8f3fcfe97666751.pdf
    • https://cdn.shopify.com/s/files/1/0463/5050/0002/files/nubusowetobifapiviko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/2642235249.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/blessed_be_your_name_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/49605409216.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/talutorelidamigemajutoji.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b6a671e68074d0092aa7839ba5754c4.pdf
    • https://static.usrfiles.com/ugd/8b2c09_f2a61d90e6be4637856b823b9b1ea77d.pdf
    • https://static.usrfiles.com/ugd/eaf48f_02acc3c0ecb841c48146ebdabe343068.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/69472533054.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/xikokimiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0465/1941/9038/files/resumen_cien_aos_de_soledad_capitulo_2.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_off00007c1f.bin
3d694d71bf3f04d3a6cdb5dee80d913f1e2df0d7f18787e86c83809683cb74cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1F 5520 bytes
font_01_sfnt_off00008ec7.bin
22849764fd1d2a6d066659ebc5750bd39e29f2775ede6d9aef72d96a3040ff77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC7 10804 bytes

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