Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b64bac77ff67c84…

MALICIOUS

PDF

34.0 KB Created: 2020-08-23 02:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8318c10a1e6ad6949172fbba7a92b75 SHA-1: 5774e2497f68912850beabd013a675a6c90dbee2 SHA-256: 4b64bac77ff67c847f56fb9aae2ef40b65f1c77dfbe00296a050a0d4f35cf446
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, specifically pointing to 'https://ttraff.cc/pify?keyword=redlands+primary+school+sileby+ofsted+report'. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

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.cc/pify?keyword=redlands+primary+school+sileby+ofsted+report
    • http://wolujudi.treeofoil.com/uploads/1/3/1/4/131454106/riwogo.pdf
    • http://files.westpotomacart.com/uploads/1/3/1/4/131454620/lolalumi_belusafedaguki.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/betuninage.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/alvarado_score.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/30723893271.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/fuseketapuleri.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/philips_universal_remote_cl035a_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/73651039730.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/93540000567.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/how_to_use_bevel_protractor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28851780814.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/62031944835.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/valuation_tre_et_avoir_au_prsent_ce1.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_off0000476e.bin
46030c76ad92e4ee266b3f6b7ebe7e8a8cbbe14c4022cf7d6de4b097e03680a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x476E 5644 bytes
font_01_sfnt_off00005a74.bin
2a1367aeede4c0f2f6498bc2fd700438dbb5b5153e19b6050cf1aec754ea2e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 9616 bytes

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