Malicious PDF — malware analysis report

Static analysis result for SHA-256 41be7899721b9149…

MALICIOUS

PDF

38.9 KB Created: 2020-08-14 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01941d26e334a157c312494fb5317e72 SHA-1: af7b6be58d254e19451d44bb3bc261745d198359 SHA-256: 41be7899721b91498379d10db5c8a6bc3ce24dd46b5d0ed4c2162132adb7833c
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes text related to 'Alternance ingenieur informatique paris' and the URL 'https://ttraff.ru/pify?keyword=alternance+ingenieur+informatique+paris', suggesting a lure for job seekers. The presence of a link farm heuristic further indicates malicious intent to drive traffic to external sites. 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.ru/pify?keyword=alternance+ingenieur+informatique+paris
    • http://files.nevskyperspective.com/uploads/1/3/1/4/131483222/3314001.pdf
    • http://files.shop-at-revived.com/uploads/1/3/0/7/130775111/7d349939.pdf
    • http://xomawezog.freshrescue.com/uploads/1/3/2/7/132740373/xudabisepezu.pdf
    • http://saxav.jillianhudon.com/uploads/1/3/1/6/131637309/4099881.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/55453372900.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/famulogux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/kupozurirenubivonasirewe.pdf
    • https://cdn.shopify.com/s/files/1/0450/0629/1102/files/alimentacion_saludable_para_nios_preescolares.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/halo_mod_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/niwovubotizifegen.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6370/files/fovuginiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2171/3060/files/bachelor_thesis_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/wexudukexot.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/12746543515.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_off0000558e.bin
86b29fcd030f6b83be04c8e37861843ffeac08429f2fa049ff6232d3fcc09922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558E 5452 bytes
font_01_sfnt_off000067fb.bin
458607e70f456dad2db301674b6dbfc95955b7e568cd9c341268c68ff2c9755c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 11624 bytes

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