Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9a570b50d2d80d…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 21:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff6eee2866e1909a8223b0d4b907ebf SHA-1: f1e3919a21be88d94c2e18bc911503103f64c048 SHA-256: df9a570b50d2d80dce1603c378d5751fefa9c0e4d295e6b4351a926cc73e060c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm. One of these links, https://ttraff.com/wix?keyword=gta+5+ceo+vehicle+cargo+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL, suggesting the primary purpose is to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=gta+5+ceo+vehicle+cargo+guide
    • https://static.usrfiles.com/ugd/9e53d4_4cad3b49557e450c925984b0e7a86504.pdf
    • https://static.usrfiles.com/ugd/b8c837_274c44d837e4401d9b06677bc2433ca2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7093ddc8f9744b2aac5c360e0eaceeec.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd3d2001f3f4b24a3b17dcfecd18bb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_543d269272a24a689d5f9a5bbf8546a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aaa9f68651048268ace09a762b54369.pdf
    • https://static.usrfiles.com/ugd/0d9a50_e3b84e8b5df34909baf0834f52d17568.pdf
    • https://static.usrfiles.com/ugd/b8c837_98cd7f61adbf4dd3a33e90340b305af8.pdf
    • https://static.usrfiles.com/ugd/b8c837_98354f1194a24134a6492c032af1aa61.pdf
    • https://cdn.shopify.com/s/files/1/0447/8684/3799/files/95914852377.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/gavut.pdf
    • https://static.usrfiles.com/ugd/2b25b5_2f7b88bdc8a54aaeb2fdd64ff936a788.pdf
    • https://static.usrfiles.com/ugd/b8c837_76a275f151d0484d8f8e58e3225e0123.pdf
    • https://static.usrfiles.com/ugd/493135_9878fbd43bc2418f83f9a51549cd6ee6.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_off00007d74.bin
f49820f48a6adbb000ba1048357176b03c927cec8961e2b5a404839746812cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D74 5236 bytes
font_01_sfnt_off00008f42.bin
28efbaf25ffde5913b1bc087094973f8a7c350c3707b131ef445142cfdff9538
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F42 10444 bytes