Malicious PDF — malware analysis report

Static analysis result for SHA-256 35de6a2ac8c85cb5…

MALICIOUS

PDF

45.3 KB Created: 2020-08-06 14:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df187d47a3224f5d028b395c0a2a0913 SHA-1: f156944d6b4777a088af8d737e280031e80b176f SHA-256: 35de6a2ac8c85cb5bd5c92bfc1f4f6e937d595825af210e7d797e5b9132c82de
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=system+admin+roles+and+responsibilities+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking malicious links. 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/pify?keyword=system+admin+roles+and+responsibilities+pdf
    • http://files.guidedchildrensadoration.com/uploads/1/3/0/7/130739158/31065d425.pdf
    • http://files.sarch3d.com/uploads/1/3/2/6/132683422/bodawagofagozon.pdf
    • http://files.rcdavis-tellinstories.com/uploads/1/3/1/3/131383624/ebc2656e5828c5.pdf
    • http://files.greenlifetr.com/uploads/1/3/2/7/132712447/aa900.pdf
    • http://files.collectorsshowcaseglass.net/uploads/1/3/1/0/131070718/5b5b6.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/forest_gnome_dnd.pdf
    • https://cdn.shopify.com/s/files/1/0431/7842/6534/files/escape_from_tarkov_inventory.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/40119075158.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/wotifumadawopelom.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/rosseta_stone_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/51292673306.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/36615183380.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/27775245023.pdf
    • https://cdn.shopify.com/s/files/1/0431/5057/3724/files/roteiro_de_leitura_mensagem_de_fernando_pessoa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1131/5611/files/21055011803.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/zirupetelezavem.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/99676802213.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/xebefadefojiloka.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_off000069e9.bin
0556835e8358ea8de64e8add7e754c42fc298bb58bcb6ba91b39fdc61e13ed5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E9 5532 bytes
font_01_sfnt_off00007c9d.bin
2235a891b034dbfcab1cf5aac69b3204c9bdd954dfb74ab5655dacf937fc45b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 12792 bytes

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