Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e67cd9c82d4d689…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 20:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4517721681eefc42ed8525a6a5cb3c5 SHA-1: 319dad225f51abd7bd4d0cb93b071c71dfac142a SHA-256: 2e67cd9c82d4d689858028c17931a885a9ef283999a95678610f29414a8dd94a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword related to a TV show. The document body and embedded links suggest a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a link farm, further supports a malicious intent.

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.ru/wix?keyword=fatmagul+dublado+capitulo+1
    • https://static.usrfiles.com/ugd/b8c837_64e22d33b8e24ab081d2ae50c4621a43.pdf
    • https://static.usrfiles.com/ugd/e8506d_855556062e3b418b8154b12bb0bcd589.pdf
    • https://static.usrfiles.com/ugd/b8c837_483394ee66ae42fe82a0d3b3a35fe1b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_44cef91b3e7e4b7b847f258b7b565b86.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_c54a0a3d391949bd90db21d03ef86877.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4661/files/printable_check_register_form_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/centum_vp_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/disadvantages_of_genetically_modified_foods.pdf
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/pumesowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/33635750399.pdf
    • https://static.usrfiles.com/ugd/b8c837_683f2d2acf5a4d01bc396865a5358437.pdf
    • https://static.usrfiles.com/ugd/b8c837_45ece43204814a668f4ebf9875de5ab5.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/luguxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7394/6275/files/52977993612.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/nojatotusu.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_off0000655c.bin
fbf4493ab553f0858d0526ac78d864fc7dd2967d20e31fae9e0c50b1023ff473
pdf-font-stream PDF embedded font (sfnt) at offset 0x655C 5264 bytes
font_01_sfnt_off00007731.bin
ba7ca6cbbc82b0e355ecb8adbf6c2b2c50def4c2e395979ae02d273a453e2e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 11400 bytes