Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34df25bfb6d06cc…

MALICIOUS

PDF

36.2 KB Created: 2020-08-09 14:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca1519708f1ce7b1e50ba77a3ff3094 SHA-1: 02b58b6c35bac7c00c4a75939e87bea2b4c236ba SHA-256: c34df25bfb6d06ccc06ab20be36cf51df40c7b25bf203b24dedc18ef95ab1c7b
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to domains associated with link farms and redirectors. One prominent URL, https://ttraff.com/pify?keyword=tensor+calculus+made+simple+sochi+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a lure to external malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=tensor+calculus+made+simple+sochi+pdf
    • http://magaja.spasavoirfaire.com/uploads/1/3/0/8/130813765/97d8a61245176e.pdf
    • http://files.yinq.net/uploads/1/3/0/7/130775732/forakivebij.pdf
    • http://files.bennyjmusic.com/uploads/1/3/1/4/131437246/3837636.pdf
    • http://tapoxi.agentsofromance.com/uploads/1/3/2/6/132681579/7957790.pdf
    • http://badori.margarettellis.com/uploads/1/3/1/0/131070161/jesakofupejomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/13867263079.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/50115292367.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/77436437693.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/35661207665.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/rcc_building_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/61277520799.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/96868449917.pdf
    • https://cdn.shopify.com/s/files/1/0431/9333/5970/files/ocr_a_level_biology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0436/6339/2921/files/free_new_year_wallpepar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/acid_alkaline_diet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/jolly_phonics_word_list.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_off00004faa.bin
a6804f3532c284d0527f719818a39897d53ecce0a08cd3e1cc9b212819992f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAA 5344 bytes
font_01_sfnt_off000061ad.bin
d5a9d3287d0175ad320abe4259d002679d5b14be3f8ab03e75f1fb6b1dce3b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 10012 bytes

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