Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0b1a3febca0ece…

MALICIOUS

PDF

62.6 KB Created: 2020-08-26 10:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8b9d6051f3af3386f691ed8e4307a5 SHA-1: d6356ee41a7f9681db5a593abdd3fa5b5429b717 SHA-256: ca0b1a3febca0ecea8d59d1c5d79db2069737ad109e14d683ead56c2731d55d9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=iniciativas+pedagogicas+en+matematic'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the attack pattern.

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=iniciativas+pedagogicas+en+matematic
    • http://tomovuvuv.keepcannabisawayfromkids.com/uploads/1/3/1/8/131857247/gizazilibibixub_difugasenoreri_zutabosikeg_tozuxiriraf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/xunolugunevepepowimuzumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/31281365747.pdf
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/dosumuzisebojazeju.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/72011565818.pdf
    • https://cdn.shopify.com/s/files/1/0439/3923/3960/files/farsi_to_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/99549257002.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/patibasiridujemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/24227664712.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/49664334678.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/20053264414.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/50991796784.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/didikezugovujabi.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_off0000b412.bin
eb0946181f4828ff09abc2cb2c3a40252e56c1fdd1a0d746e39608fa0d73a800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 5264 bytes
font_01_sfnt_off0000c5e8.bin
ad0d76634afd5aea5881b818c633f4c24b2c0c1594d87be4200c08b2f465ee0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 11832 bytes

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