Malicious PDF — malware analysis report

Static analysis result for SHA-256 462dab9553f77990…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 00:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b0d1eae212b0bc7d220ad8d37c8119 SHA-1: a21ba993780a56e1eaa5c9d330c67cccd7a962a8 SHA-256: 462dab9553f779908984e563dd9e688b0b361b442e1c42830f57ec14d095ac10
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.ru/pify?keyword=trinomial+factoring+worksheet+pdf'. This URL is embedded within the document body, suggesting a lure to trick users into navigating to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm strategy. The ML classifier also 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=trinomial+factoring+worksheet+pdf
    • http://files.highlevelstore.com/uploads/1/3/1/4/131452878/0efa88d83c439.pdf
    • http://bavutiv.bltsnv.org/uploads/1/3/1/1/131163930/c08c3f991.pdf
    • http://lowatevo.yanka-online.com/uploads/1/3/1/4/131483068/sobamumiwumol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/20864569148.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/bash_for_loop.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/budowufixeroxap.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/rinonumogepoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/22522655471.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/livesusuboloviwofew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/80549788603.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/40641534560.pdf
    • https://cdn.shopify.com/s/files/1/0437/3987/3429/files/saxon_advanced_mathematics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/jaraxod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/kupinobixowukolusog.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_off00006bb2.bin
889b4ef57d8c63cd87bb19c08cd9bf2b8cd8bd75254a177fcb13197834290624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB2 5672 bytes
font_01_sfnt_off00007ed9.bin
289dbcb3ed05c1769affedb0f0644e0bd0cc2cd7e8666e9713c635acf58090aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED9 10476 bytes

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