Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9b80669fa6dd8f…

MALICIOUS

PDF

75.5 KB Created: 2020-08-09 16:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d64ff810f02fd1d9a918f291a2fab4 SHA-1: 2ac6b681fbf2145af08ee59a04d36005d7d37c78 SHA-256: 0d9b80669fa6dd8f604fe7bbda2286548f96738ccd7ebe99b7d87a87afc50c36
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or phishing attempt. The presence of a 'download button' lure further supports this. The ML classifier strongly flagged this PDF as malicious, and the embedded URL leads to a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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=archie+comics+pdf+vk
    • http://files.simcoshelties.net/uploads/1/3/2/6/132681992/jopekud-zobaledujelulud-zifuj.pdf
    • http://files.mikelipari.com/uploads/1/3/1/6/131606109/zufutafo.pdf
    • http://files.theresasegal.com/uploads/1/3/0/9/130969048/96424e46b76eac.pdf
    • http://toboxokus.shcslibrary.org/uploads/1/3/0/7/130738615/gazujanabak_podopasula.pdf
    • http://files.glassworkshop.co.uk/uploads/1/3/2/6/132682882/e289ff9dc865a2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/my_gym_partner_s_a_monkey_cast.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/asia_map_hd_image.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/togevinen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7351/files/17270962965.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/98580811369.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/54286109464.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1318/files/minecraft_xbox_one_mods.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/kidevozasofep.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/kayak_pools_midwest.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/21673953907.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/juworamopip.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/68913791220.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c9.bin
fcbff72fd87b6b220bc6a4c6f3dfd490488b77291a00ccd5bed71031cbf793ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5268 bytes
font_01_sfnt_off0000e495.bin
ad08ef49d3b50fbcb1cad5c4108214c1f60caf09e6b4c06eeb7620c88abd08c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 11688 bytes
font_02_sfnt_off00010bea.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 16092 bytes

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