Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca8e68ec4bd51b9…

MALICIOUS

PDF

38.8 KB Created: 2020-08-26 17:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 911941007429e71ce75b812c5b16348f SHA-1: 1f3d47cf22d021a308885b789f10c105700f8e18 SHA-256: 4ca8e68ec4bd51b994ccc3f65189a66616ab13c797bc59d4306fbdc28b264a78
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=solid+liquid+gas+worksheets+pdf, which is likely the primary lure. The PDF also contains a mass external PDF link farm, with many links pointing to benign Shopify domains, likely an attempt to mask the malicious redirector. No scripts were extracted from this sample.

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.cc/pify?keyword=solid+liquid+gas+worksheets+pdf
    • http://files.joesoftball.net/uploads/1/3/1/3/131398278/6a58ca743018.pdf
    • http://files.makeitrainbitcoins.com/uploads/1/3/0/8/130873822/sibuvo-wobakazuze-xibon.pdf
    • http://files.studioofcreativity.com/uploads/1/3/1/3/131384401/5656979.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/autodesk_123d_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/biography_of_bhagat_singh_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/bedaninawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/54016482566.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/gossip_girl_cecily_von_ziegesar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/ruliguvogasadokovisivigob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/90399769513.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/44604037927.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_off00005948.bin
f16c6d99bcbff921ecbda6b718f8f0548aef58fe9de2b6f38fb9409ea22916e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5948 5688 bytes
font_01_sfnt_off00006c9f.bin
28da710e96630af5c73f79cf0b809e17f723f930279b9ad5ea06c0252214e4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9F 9996 bytes

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