Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34c0386c5eade77…

MALICIOUS

PDF

56.1 KB Created: 2020-08-31 01:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19b6d17c95aef64c689a2ecebc87ac0 SHA-1: 787247b913756824bb50c9b7afcc7130a5bf4aa6 SHA-256: a34c0386c5eade7792e54fca918f0e494f653f868bcae2a55b3f21d6a587fd32
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.club'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a compromised site.

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.club/wix?keyword=unf+thread+pitch+chart
    • https://static.usrfiles.com/ugd/b8c837_cb5198f9a05242d795593a5d9e023a19.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_7384bb91396a41a6a639eab4345dca38.pdf
    • https://static.usrfiles.com/ugd/b8c837_6019ff8e958f41e58820a011ac57f7fc.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/download_books_online_free_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/2163/0631/files/11650082962.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/zapixopidebefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/merge_bmp_files_to.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2a30a9a72904156b09b47f6b151624a.pdf
    • https://static.usrfiles.com/ugd/cc14e4_3cc5fdc907fd4bc1add173b17f71178b.pdf
    • https://static.usrfiles.com/ugd/097bd5_ca601c1d565342a5a984a84e688b58fa.pdf
    • https://static.usrfiles.com/ugd/93c935_76663c0476a3490187a30e686bdd444e.pdf
    • https://cdn.shopify.com/s/files/1/0460/7141/4948/files/time_complexity_of_data_structures_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/bepekagarexupisolusuzip.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_off000079fa.bin
dda48f8fd9e0e3d0b93f0af20d401cfa7efdd937421ce0ee5b28bc0971d138e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FA 5024 bytes
font_01_sfnt_off00008afd.bin
1da2939935376100f59a75fa0e50666b1fd589d9c6ddfc9239d23211d71fb5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 16488 bytes
font_02_sfnt_off0000bf32.bin
28c03bcf599e3456f71dbda7a9940e8017c4b7a6e15fdbd9d4eba8bfcd1a11e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 16064 bytes

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