Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cdeff130daa17a…

MALICIOUS

PDF

44.6 KB Created: 2020-08-26 16:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035c481cf10f89e1e1273734e512a9f1 SHA-1: 81d3ee88bb719b0b6354226d9442bc1abf7dae2c SHA-256: 97cdeff130daa17a3d332f4938853e7ec0ff3f9c7df0a1e735d67d316f5684b5
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=on+chesil+beach+pdf'. 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 primary malicious URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious redirect.

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=on+chesil+beach+pdf
    • http://fadivabu.pottershouselismore.com/uploads/1/3/0/7/130738973/lutebawijivoke-bukojevu-rulipobulikefa.pdf
    • http://files.chaminadechoirs.org/uploads/1/3/1/4/131453512/tonapiwupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95909873105.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8324/files/21501169512.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/types_of_belt_conveyor_systems.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/equity_reedsville_market_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/91735759031.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/57049005427.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/adrenal_cortex_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/automotive_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/83067481647.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/bifidufewejubusajabekowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/51647380536.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_off00007095.bin
3754ed83ee6b53e774c8a4d4473eb2d265f7b9fc1814c1ba75d416af8ee31894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7095 5312 bytes
font_01_sfnt_off00008294.bin
6b1cd0172b75779a5409382957b23904e948629374aed31935019bf2c1b430b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 10372 bytes

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