Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9a63e80359473…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 09:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2247a6552a0ac61b688d6d774f563a2 SHA-1: a3129dcb4f759d5447977d224dde8e7581cb053e SHA-256: c8b9a63e80359473c1dc00c05b1242e2cb22b9fd02a83abb64d26782002bf82b
150 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including one that redirects to known malicious infrastructure. The primary lure appears to be "cervical stretching exercises pdf", which is used in the malicious redirector URL. The document body is heavily obfuscated and contains a URL that is also present in the link farm. The ML classifier strongly indicates maliciousness.

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=cervical+stretching+exercises+pdf
    • http://files.thepurposedathlete.com/uploads/1/3/0/8/130813395/8dcb9c2f3fad.pdf
    • http://files.nexusdesign.co/uploads/1/3/0/7/130776769/likekovuwis_kavukade_lekodunir_jajenekojivodo.pdf
    • http://files.michellescreations.shop/uploads/1/3/2/6/132682883/bf45856104.pdf
    • http://files.jose-figueroa.com/uploads/1/3/1/3/131382395/0bdb7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/72724711611.pdf
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/rs_aggarwal_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/nakufinipejepuruxudan.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/beserugixapam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/73901590698.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/59365091296.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/the_art_of_living_book_epictetus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/1698121835.pdf
    • https://cdn.shopify.com/s/files/1/0444/2108/7398/files/alphabet_worksheets_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/wuzavaporitifaxono.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/27992120949.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_off0000616f.bin
820a64303e3e65d0d73ddd8ae81003c0d11326e44981c1f12a98fbeee6319b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5448 bytes
font_01_sfnt_off000073fa.bin
3216393ff6219d3f7b4735d85c2bb4ec87409409202f0917aac5b88b1464105f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10704 bytes

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