Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3c536551ca7f2b…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 12:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f68c78842f0d62f91e5d22c9dd18fc SHA-1: a179070fe4a7f2b0d4ef93be050ad79fa67036aa SHA-256: 2c3c536551ca7f2bba007cc849cc11d311c042e311c64fe9959723b85c9e2d80
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to career path worksheets. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF also contains a large number of links to other PDFs hosted on Shopify, which is flagged as a link farm.

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.me/pify?keyword=choosing+a+career+path+worksheet
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1628/files/armaan_malik_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/border_song_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/34057356166.pdf
    • https://static.usrfiles.com/ugd/3cb679_58d74695257a463fafa90589f98a1e77.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbdc4d9df8e143d49364559de6ee72a1.pdf
    • https://static.usrfiles.com/ugd/b11f6d_5cc87f2e5fb14b3b9636e884f6803f99.pdf
    • https://static.usrfiles.com/ugd/9734e7_565727033eb04c808d7e9b8a6660b9e9.pdf
    • https://cdn.shopify.com/s/files/1/0439/2920/6939/files/tunufimositobororakisusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/zemasijodexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/86564324205.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/arcmap_basic_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/tanimukenawanumov.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_off00006d23.bin
75e64380d156b8f6333941a53563abc8a9351950a5a623bf70313ab05565cc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 5224 bytes
font_01_sfnt_off00007ef7.bin
5477ae76938daa4af0b778befbaf88f59dbc7162879f966b5c2ac055566b5972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 10300 bytes

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