Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf401df6ad16b284…

MALICIOUS

PDF

57.8 KB Created: 2020-08-30 14:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c0604e1e54e96eb519f0729a91c72f SHA-1: 48e3cca10517f93fa296ad0d51b7bcb963bc3a19 SHA-256: cf401df6ad16b284242e3bc0ece5c8f2066882d0403add95183902d043c33e37
152 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.cc/wix?keyword=twilight+princess+hd+emulator'. This URL is likely used to lure users to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=twilight+princess+hd+emulator
    • https://static.usrfiles.com/ugd/b8c837_bb7553ecb1ec4367884471ef84d1f983.pdf
    • https://static.usrfiles.com/ugd/0c4177_dd04c8cc57a1499c839523f83aff3991.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f51a34afd0d42d5816428ad1138ae6d.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/anova_test_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/fozofipetazefipusafozez.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/11787787284.pdf
    • https://cdn.shopify.com/s/files/1/0459/9663/8375/files/conan_exiles_armor_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/72967219639.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/85040683429.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/asymmetric_information_theory_slideshare.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d69e7d67fab432a97d0fad4414a40cc.pdf
    • https://static.usrfiles.com/ugd/bae363_9ddff6be9a364e44a871bb7d24303944.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_off00008c15.bin
c3dc10ecc7689a6cd4d76410d13f366eb7cb77e259544bbf9f38f5b91f3b4102
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C15 5412 bytes
font_01_sfnt_off00009e58.bin
681adfb590e82368033a5839ba72926b393364356b9f761bad60879228de8e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E58 14812 bytes
font_02_sfnt_off0000cc13.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 4324 bytes