Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dab66067e9a61a…

MALICIOUS

PDF

47.0 KB Created: 2020-07-30 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 525d33550222545b265803351e2bd4c6 SHA-1: 332aa623c3f3e39c77049e34cebfeaa2377deb3e SHA-256: 81dab66067e9a61a5ca4124ae2c9f5958e774b6385bb5e2f6c02776a61b8c309
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to Shopify-hosted PDFs, suggesting a tactic to distribute content or mask malicious activity. The document body, though heavily obfuscated, contains text related to 'ctet answer key 2020 paper 2 pdf', aligning with the lure of providing a document. The presence of a 'download button' heuristic further supports the idea of a deceptive download lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ctet+answer+key+2020+paper+2+pdf
    • http://files.marinashay.com/uploads/1/3/1/4/131406518/440cbd99bb939f.pdf
    • http://files.sensefitnesscoaching.com/uploads/1/3/0/8/130814596/ab02cbef5f2a6.pdf
    • http://files.zmagazine.co/uploads/1/3/1/3/131379117/37d3b8d231bac.pdf
    • http://files.g3valeting.co.uk/uploads/1/3/1/8/131871477/2554986.pdf
    • http://files.allisoncamerongray.com/uploads/1/3/0/9/130969172/fegebibadivak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/81400547239.pdf
    • https://cdn.shopify.com/s/files/1/0435/3291/0751/files/66150656467.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/butuzuziritulafet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/23013281884.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/zigimivolebifosukek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/27939165967.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/gunivaluvenenujafuxalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/kirevezogifetikuxepijire.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/72832392098.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/42518116479.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_off00007a1a.bin
1d4891f2cb7ccc4dbd2c0d8d020912e69bb463e0503f9e50aecbaa7ae2e0bea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1A 5188 bytes
font_01_sfnt_off00008bdc.bin
e990eb85a4bc8f33dcd6102b09339b08c938e5b291430ca5c77efe89a698996a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDC 10380 bytes