Malicious PDF — malware analysis report

Static analysis result for SHA-256 4030cb80e3aead00…

MALICIOUS

PDF

49.2 KB Created: 2020-08-02 09:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1814a954dea5325e3d7935686fab1f9c SHA-1: faa47eecbf5052b3afcaca735c65d7a158cb13fb SHA-256: 4030cb80e3aead0085fbba3c97d232f55a889e6d6e959a983adb4257b0d2c09e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating these links point to known malicious redirector infrastructure. The primary redirector URL is https://ttraff.com/pify?keyword=legendary+markings+feral+heart. The document body itself is largely unreadable binary data, but it does contain the same redirector URL and several Shopify-hosted PDF links, suggesting a link farm used to obscure the malicious destination. The ML classifier also 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.com/pify?keyword=legendary+markings+feral+heart
    • http://files.bhktrading.com/uploads/1/3/1/3/131398591/rujurad_pewilu.pdf
    • http://files.drivenbypleasure.com/uploads/1/3/0/7/130740323/cade6d1ed1b4fc.pdf
    • http://files.dragonflyday.org/uploads/1/3/1/6/131606874/soxogo.pdf
    • http://files.isaacsquarterly.com/uploads/1/3/1/4/131407353/jugowiminevumop-bisidasagomeb-sesopesiz-munop.pdf
    • http://files.myjungleservices.com/uploads/1/3/1/0/131070674/telikumujoxipimulali.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/14706181871.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7591/files/27104540144.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/depexapisegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/5427157746.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66656561998.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/17948894146.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/sigefib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/79690403847.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/22121126210.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/61347944024.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/94982546425.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5060/files/30304062651.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_off000081bd.bin
9201f0328e8090c14601f334492ffa87f5f07c5ab123c5f7e1d02338c5888620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BD 5428 bytes
font_01_sfnt_off0000941d.bin
c4422ea9ad2f3f0016c5fc71cae0caea834ac50391fc1cb90edc96c68d3e4300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941D 10372 bytes

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