Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfd8a7e67d410df…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 09:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abc9925c20645f506a5ef6f53759c27 SHA-1: 237cdbaf731e0d1a9c0e4d0a48923c1139b1549a SHA-256: 9bfd8a7e67d410df55ad0575c5a8621b6fdd0c82dd429b9534f5e8f0a24920b4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=antecedentes+derechos+humanos+pdf. Additionally, it features a PDF link farm with numerous links hosted on Shopify, suggesting a broad distribution attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL, reinforcing the attack pattern.

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=antecedentes+derechos+humanos+pdf
    • http://files.petalcup.com/uploads/1/3/2/6/132695596/nadokidafetaz_webirubasovug.pdf
    • http://files.jacksongirlssoccer.com/uploads/1/3/1/3/131380612/jukasowopulib-derafunuxuvofud-bolopori-nigagutofifitoz.pdf
    • http://files.thespeechspacedc.com/uploads/1/3/0/7/130775655/mobuv.pdf
    • http://wupizewon.sceat.net/uploads/1/3/0/7/130739592/2702564.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/67864614007.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/58035307852.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/jogapixijenejedagif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0439/0413/9416/files/50247447410.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/8066520348.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/jixinitokixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/14143976743.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/94439842479.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0434/5164/6119/files/discord_syntax_codes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/zusumowubokokinewip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/arabic_alphabet_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/7330351065.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_off0000623d.bin
6ee2997d9f16b04d6852ad858937abb0b07844492c6697f9b940955ee6194188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623D 5352 bytes
font_01_sfnt_off0000743e.bin
c6bd6af7ca46cd6a1be4d90363b7db930e2ef57d6c903c6a7588843b045c5d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743E 11120 bytes

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