Malicious PDF — malware analysis report

Static analysis result for SHA-256 2395fc7972cf0a8d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-09 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98b5d9a90f9bbbccfd0d03fb993058a SHA-1: e84290915cec076b09cd9c4c76e3bc2c004902cd SHA-256: 2395fc7972cf0a8dffbcc5c7709e242e694d3d54e09e204409872048179bfe66
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=el+barril+de+amontillado+pdf'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0435/4277/3914/files/37572763057.pdf'. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=el+barril+de+amontillado+pdf
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • http://nakoxege.christistewart.com/uploads/1/3/1/8/131856584/walog_vizapud.pdf
    • http://files.kianacox.com/uploads/1/3/2/7/132712043/ea71b74ee54.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/37572763057.pdf
    • https://cdn.shopify.com/s/files/1/0437/0645/0074/files/causative_exercises_b2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/cecil_medicine_23rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/gebaporubaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/gubap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5446/4165/files/39427406706.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/wobinutorofenobebonarit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/tmux_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/29182044019.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/15404989914.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/83189795125.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_off000071dc.bin
08540003f543fc4aa04df51b88beb403c081d07daa773cc98bfb3c8ad4a3ae26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 5108 bytes
font_01_sfnt_off00008323.bin
8799af94f3a80c88227205b538f47c7bcebba321226566d46c24deb226e202d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8323 11072 bytes

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