Malicious PDF — malware analysis report

Static analysis result for SHA-256 8081bafdc3edd277…

MALICIOUS

PDF

62.8 KB Created: 2020-09-01 11:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48ed803ebcc7460bceba2d171755af8f SHA-1: e5042dd90b215cffb681165ff91798e0c17a93af SHA-256: 8081bafdc3edd277d6ceda15538546824115be75e8df7d95eeeea0d64032acaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 30 external PDF links, one of which, 'https://ttraff.club/wix?keyword=ajay+devgan+songs+video', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other benign-looking Shopify links, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=ajay+devgan+songs+video
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/roxopomukopiga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/91500650762.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/felube.pdf
    • https://static.usrfiles.com/ugd/b8c837_c23f1188a5154b8980cb8176da2cb52b.pdf
    • https://static.usrfiles.com/ugd/3ce946_58bda787024a48e79103e63ff32c16c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bb7376ddafa4b858ccae59bcf8f2591.pdf
    • https://static.usrfiles.com/ugd/24853a_d3fd9b3bae844b2b9d2d615c16732c8b.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/tigafudegafixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/artificial_selection_in_animals.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/rapprochement_bancaire_cours.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6315/files/56979207174.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/2659812780.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/karerasiduso.pdf
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/2017_corolla_repair_manual.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098da.bin
a0506e2f131b63c96abc6f87da1f1ed47d49399a8cc0f9ba83c8c88cf449a113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DA 5092 bytes
font_01_sfnt_off0000aa56.bin
8f8eb74631976d1ec1a3548aa1372acd7c67c4a15371b756e21aad80c4ef184e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA56 14928 bytes
font_02_sfnt_off0000d8f5.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16204 bytes

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