Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fa70996e837f18…

MALICIOUS

PDF

51.2 KB Created: 2020-08-07 12:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91a3a62f9da025b8bfaecbed68262aa SHA-1: 1c20abd7d6459d634c94937fe066a766469d2091 SHA-256: 91fa70996e837f18040028e0c46e6ebc30ddddfdb18388ea7d14d5fe7817a9ed
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'Austin community college calendar pdf' and the URL 'https://ttraff.cc/pify?keyword=austin+community+college+calendar+pdf', suggesting a lure to a phishing or malware distribution site. The presence of numerous Shopify-hosted PDF links further indicates a link farm strategy, likely to improve search engine ranking for malicious content.

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=austin+community+college+calendar+pdf
    • http://ruxip.michellekhuu.com/uploads/1/3/1/4/131438216/68d1120538799.pdf
    • http://files.covidhelp4highland.org/uploads/1/3/0/8/130814717/5513848.pdf
    • http://files.sankofachiropracticcare.com/uploads/1/3/0/8/130874435/lodejiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/13810063147.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/i_am_not_spock.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/nufavafoguxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/vodumorazatofub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6065/files/zavinelarigokiwadamo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/kofapexojusite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/68736294054.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/kigebokizami.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/77555135719.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_off00008a4c.bin
4455badb9f51057a58a439a669901378c883fad24b3a43262e0f6d4ae3c70a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4C 5564 bytes
font_01_sfnt_off00009d32.bin
f53713600f5fdc5c3473a93253b19a7f6b8434631a1b3125be88eb50850ec9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D32 10140 bytes

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