Malicious PDF — malware analysis report

Static analysis result for SHA-256 9060388d5d74cafe…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 11:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0183aca84e44c9d46fee2e320f2d7de SHA-1: 21c3890c13d19cefbd07eb10eeb172926e9f1752 SHA-256: 9060388d5d74cafe4dc6e03b8c32da825b1aabce67f4772839e0e13bfa809be0
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=kcse+revision+questions+and+answers+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily corrupted, appears to be an attempt to disguise the malicious intent with keywords related to educational materials. No scripts were extracted from this sample.

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=kcse+revision+questions+and+answers+pdf
    • http://radipep.drydenpres.com/uploads/1/3/1/4/131454762/jemesafivumajid.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6876/files/18437942736.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4045/6360/files/92763901914.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/fokisonoxojagavujetewavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/fofajawojoxuguv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/298710461.pdf
    • https://cdn.shopify.com/s/files/1/0435/0210/8836/files/59393069334.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/maxupeseviv.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/36288154580.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/wamizipobomovamase.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/91539311733.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/wixiturojepuse.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_off0000589f.bin
a2a76cf35712ff59f5d75e2a7fe39aeb443963e06733b2ddc8a9e7ed8661cd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589F 5364 bytes
font_01_sfnt_off00006b07.bin
ce5e50879197582a3ada7e72d1c37a894491d784a57846c416c36a94475117cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B07 10312 bytes

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