Malicious PDF — malware analysis report

Static analysis result for SHA-256 27102815fd6f6394…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 00:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f2ffeba5da33b2f0e5cd567e7ccb83 SHA-1: 59293a91cffb0df895ce0bbfd5cad03e53fa3929 SHA-256: 27102815fd6f6394cbfc0695fc325a2288fbcf4b974522d03fde637d25b2c3a5
150 Risk Score

Malware Insights

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

The PDF file contains a link farm of numerous external PDF links, with the primary link pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to be mostly garbage data, but it does contain the malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised as a document. No scripts were extracted from this sample.

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=antisepsia+definicion+pdf
    • http://files.tealiciously.co.uk/uploads/1/3/1/6/131606125/82e3c4203fd.pdf
    • http://files.dragonflygifts.org/uploads/1/3/1/4/131438538/370c56d90e.pdf
    • http://zetit.libraryatlantic.com/uploads/1/3/1/0/131070161/9845758.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/51788576912.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/viwonuti.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/jixidukekaxalilos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/gastrointestinal_tract.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/38911334004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/framed_ink_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/40279088355.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/fuwupupowuda.pdf
    • https://cdn.shopify.com/s/files/1/0427/9726/9159/files/agility_drills_for_football.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_off0000732d.bin
6a53616c07309525c8911e5213ddf56f20f2c7253221737442f291aa7ec8901a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 5012 bytes
font_01_sfnt_off00008453.bin
8505baa778fd567b08dfd198c5fe008c5c1cb36ddb20142e06377429ac972a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8453 10564 bytes

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