Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdaa6318125e089…

MALICIOUS

PDF

32.3 KB Created: 2020-08-08 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ca092c4ef84a21d976703078dceb8f SHA-1: 21854673475e02df148f966370de3cacc5c9d935 SHA-256: 4bdaa6318125e08960446b94b54db02961a2553d5a63d18f37ada656f2b0ced3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that points to `https://ttraff.ru/pify?keyword=compreender+o+behaviorismo+pdf+baixar`. This link is designed to lure users into downloading what appears to be a legitimate PDF, but instead leads to malicious infrastructure. The PDF also contains a mass external PDF link farm, with many links hosted on `cdn.shopify.com`, suggesting an attempt to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=compreender+o+behaviorismo+pdf+baixar
    • http://vurul.laurel-lakes.net/uploads/1/3/0/7/130775607/9159589.pdf
    • http://files.thebusybench.com/uploads/1/3/1/0/131069992/53f41b34a8cc2d.pdf
    • http://files.4loveofbaskets.com/uploads/1/3/2/6/132681698/2119523.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/8551963257.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/boundary_value_analysis_in_software_testing.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/84219312083.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4065/files/symmetric_vs_asymmetric_encryption.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/zerazarikup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/51092605024.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/25489486320.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/jeppesen_private_pilot_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/daribobanelop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/webmail_apsk12_org.pdf
    • https://cdn.shopify.com/s/files/1/0432/9934/0448/files/17531712042.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_off00004206.bin
7dfb2b8112dbaef9729f18d008229ea9891025c090220117cd1e17b4ee6bd57c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4206 5424 bytes
font_01_sfnt_off00005444.bin
db73d9e04b1394a09add494f06d31952f13a07b8d5b0a9d812616d0c86edb83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5444 9324 bytes

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