Malicious PDF — malware analysis report

Static analysis result for SHA-256 20db624d8af11cf5…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e8504033debf8bca337ba06a9c0d709 SHA-1: cc6ea6c51a0dd0ad916d886e1e611677969c72be SHA-256: 20db624d8af11cf56b6cff27bffa265d71f714d5d9d8528e7d15ee27f7fc6ed9
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The embedded URL 'https://ttraff.cc/pify?keyword=calendario+laboral+colombia+2018+pdf' is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The numerous shopify.com links appear to be part of a SEO spam campaign to distribute malicious PDFs.

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=calendario+laboral+colombia+2018+pdf
    • http://files.paintedturtle.co/uploads/1/3/1/3/131384115/fb6e72c34255.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8500/files/16087772656.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/denulob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1285/files/27897800622.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/design_sprint_livro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/tikudoxekevenuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/mac_creator.pdf
    • https://cdn.shopify.com/s/files/1/0448/0542/3253/files/fubajovetep.pdf
    • https://cdn.shopify.com/s/files/1/0435/9444/9055/files/40449606449.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/65178584856.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3625/files/khorne_bloodbound_warscrolls.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2208/files/pixaforobuvisirojipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/bronchiolitis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/barron_s_earth_science_regents_book.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_off00005cdf.bin
f67490a2ace629d8204758b84552f9ad83dc7ce6a268947f1fc3b8a997f95327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 5688 bytes
font_01_sfnt_off00007021.bin
0c18bd06cfb631cdc4a0a85eacdd8f134bf7db63968a1192ab18210335804796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 10552 bytes

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