Malicious PDF — malware analysis report

Static analysis result for SHA-256 501bf0efe2316231…

MALICIOUS

PDF

42.7 KB Created: 2020-08-03 21:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a053fb4e159c72a84a1851cdb384b124 SHA-1: 78fc7d5acfc8aa67f3b76a8f49bd757559c6e09a SHA-256: 501bf0efe2316231e88e1dd7c3baf611048d0fc04824c1841feaf1344bc6056f
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=grammar+questions+with+answers+pdf', suggesting a lure to a page offering grammar questions. The ML classifier also strongly indicated maliciousness.

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=grammar+questions+with+answers+pdf
    • http://files.rialtosports.com/uploads/1/3/0/8/130874647/159218.pdf
    • http://lekom.doggiestylezllc.com/uploads/1/3/1/1/131163635/figopi.pdf
    • http://files.passagesandpathways.com/uploads/1/3/2/3/132303041/7920656.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/24369533738.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/28060116143.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/61107365008.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/bufatabujetunizer.pdf
    • https://cdn.shopify.com/s/files/1/0440/0054/2878/files/gebegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/sort_linked_list_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/lusebarejejogofaguk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/68408193474.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/kamiguxigonaboguvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/giwewu.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_off0000669a.bin
246bdad350aeb525cfe799a9a25f47c6ed9ae34e821547cf88ebdc3e8c81022f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669A 5500 bytes
font_01_sfnt_off00007936.bin
a64082db6e8407b2a3bba7b5f4624537aa259f63c3553d1ea55f79deb1de93b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7936 10684 bytes

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