Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e5a0a5a63251cd…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 01:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b47412d1961745838b82fcd6d05f41fd SHA-1: 489d6afd4fe08a96452568ef7f806a3429444135 SHA-256: 38e5a0a5a63251cda7001701edade5892d1b5f76a6d635ff25a00cc5be8b871d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at ttraff.com, which is likely used to obscure the final destination. The document body, though heavily corrupted, contains text related to examination stress and the URL that triggered the malicious redirector, suggesting a lure to a phishing or malware site.

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.com/pify?keyword=the+causes+and+effects+of+examination+stress+on+students+pdf
    • http://files.theidealcrew.com/uploads/1/3/1/3/131380171/wijufade_buxuto.pdf
    • http://files.armillerdesign.com/uploads/1/3/0/7/130739232/4479699.pdf
    • http://files.buttercreamlane.com/uploads/1/3/1/6/131637190/4422115.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/dilililudifowuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/zutilovotexatobekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/witaxujuwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2509/7126/files/28201184575.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/mujuxerob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4820/files/65969562262.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/sixofigumusetemen.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/fegogifobazeluwinepupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/finra_series_79.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/16485491922.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/kuzaxewumijedab.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_off0000652e.bin
8bda6568c4e653e5424efb70c1e788022620d9a2e35d16fea85106297e641906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652E 5380 bytes
font_01_sfnt_off00007757.bin
3af7338ef0654d0305504166699a55d38260da589e7d03550b40a3ac40b0ddf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7757 10120 bytes

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