Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4447410ddbc1c6…

MALICIOUS

PDF

47.3 KB Created: 2020-08-24 00:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 225498c81999738e6203c2445f150cf9 SHA-1: 48a2b1a89f488439c5908cf0978174271e048ea5 SHA-256: cb4447410ddbc1c6b219cca7a1060e21cf1fd4003f48bafab58ed9d5094e374c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains but ultimately redirect to a known malicious URL (https://ttraff.cc/pify?keyword=comma+engine+oil+guide). This indicates a link farm or redirection tactic designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.cc/pify?keyword=comma+engine+oil+guide
    • http://sowuz.badgerwifi.com/uploads/1/3/2/3/132302815/d300b7593bb7ac8.pdf
    • http://files.nectrathletics.com/uploads/1/3/1/4/131455832/2461608.pdf
    • http://files.salasirian.eu/uploads/1/3/0/7/130738701/zujosutujasafawosid.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/41137701171.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/84679810038.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/lakabirudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/xukuti.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/jevefunagovizafixejigagad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2193/files/ccna_3_chapter_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3419/files/63459673484.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/aceite_esencial_de_mandarina.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/jeboxubote.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/fufemegujavunimirazeva.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/ust_to_cst.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054c1.bin
ae51a5d9e00bff8491f01aa22e41db5b6c18fe4bca25d95cac23bd0a0e558417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C1 4220 bytes
font_01_sfnt_off0000638f.bin
580f1d3f45c2dd38515cbdfd680e9de9832261c1a86b5f3dc6961403b4e39f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638F 4776 bytes
font_02_sfnt_off000073a6.bin
538512be6c526ea957b587fa229624d829dca4873b622d187784a60d2c877fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 6640 bytes
font_03_sfnt_off00008544.bin
82a555e2b9c0a7e305bcd5ae681923153e2592461ec71f27771b64e8d0faf6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8544 13308 bytes

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