Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b663ad21bd06521…

MALICIOUS

PDF

47.8 KB Created: 2020-09-01 09:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b94cd4459d0aaadb11e8baa4278b48f5 SHA-1: 24807a00a5e76e4d713400e3b553f190c4cc91a6 SHA-256: 8b663ad21bd065211fa5e205b08d743e5cb2be4d177803724030fc4baf180209
150 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 'https://ttraff.ru/wix?keyword=bir%25C5%259Feyler+olacak+yar%25C4%25B1n+pdf'. This indicates the document's primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=bir%25C5%259Feyler+olacak+yar%25C4%25B1n+pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/sikini.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8700/files/market_leader_advanced_business_english_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/sirir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/38792625714.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/chemistry_notes_for_class_12_cbse_free_download.pdf
    • https://static.usrfiles.com/ugd/0d002d_6528d35f1b9a49d0b917a73329d250c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_16064dedc23c41148a2f399905ceec76.pdf
    • https://static.usrfiles.com/ugd/b8c837_5706dc71ac81497597232a735f013d13.pdf
    • https://static.usrfiles.com/ugd/1e32c2_fa08e57f59c54c56baf4ec2b55f9d633.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1703/files/wayne_dalton_torquemaster_spring_replacement_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5252/files/rexokisani.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/tedaxelulosadesekiwatoxij.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/40336144762.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/pokarad.pdf
    • https://static.usrfiles.com/ugd/b8c837_9015b1e3454d4fabb526a9633a00aa3b.pdf
    • https://static.usrfiles.com/ugd/74a852_1504d054e65440b28e20f160ffc428eb.pdf
    • https://static.usrfiles.com/ugd/15d534_d06a4e903ef84b78b8eeaa4e712c17d6.pdf
    • https://static.usrfiles.com/ugd/2ca09c_f79e6a03ed194e5394692f7fb981e907.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/
    • https://static.usrfiles.com/ugd/2ca09c_f79e6a03ed194e5394692f7fb

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006020.bin
1282912f7af1461cc8c9bedade6d8a1a5c5709a3b611650d0f9bd1b5f41fa325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6020 5464 bytes
font_01_sfnt_off000072d4.bin
73b4665477c49f34eb74fc14231a349642491905bdc89c7d6429fdd0dd429c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D4 11744 bytes
font_02_sfnt_off00009729.bin
8e2e75b87ae20a55125b9ef0f7a17de8a0f25730a8d53d43ba814f43b8f9fab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9729 17100 bytes

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