Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31063c588469d2c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-01 13:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef67da0f8f901ea08a2848b5bc1ea8cf SHA-1: 76d01368faaddcb22671e83455ffe8067d6982c0 SHA-256: b31063c588469d2cade02e0c6bcfe7638d114e2cb29c7217d69f86db9ef326be
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'free mblex study guide pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous links, many pointing to Shopify domains, indicates a link farm strategy to improve search engine ranking for malicious content.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=free+mblex+study+guide+pdf
    • http://files.indianausbr35.com/uploads/1/3/1/4/131455680/peduvonedi.pdf
    • http://files.shakirazchi.com/uploads/1/3/1/4/131408241/c3954e41.pdf
    • http://files.harvieherrington.com/uploads/1/3/1/8/131871745/82bb851af044.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/21895923638.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/renatafuxuregitebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/34423261338.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/jofiwexiravori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/bizevureli.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/13457591102.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/36824896264.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/foriwiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/29244290285.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/ruvewebizokofamozifu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/xokilogoledijazurum.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/math_background_image.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/488968936.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_off00006b66.bin
9a7802d617846d8af71ba8a7e85d75a555bf214bbc56c13c74f6c463dbb0d8b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B66 5416 bytes
font_01_sfnt_off00007dca.bin
762adf04a5d23423fcf957a366bb4db11a8bdf0ec0cb86dc6c3478c92125ca20
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCA 10696 bytes