Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3a0d8f6ba6e7f5…

MALICIOUS

PDF

53.0 KB Created: 2020-08-22 19:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d671f50f875dde192ce4339a75b6075 SHA-1: 7b134e02d3e86755a8e616772331334b428d2190 SHA-256: 9d3a0d8f6ba6e7f57f21243f3856f1beb25e141f8824fa5f3303876e904db4af
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=humoresque+trumpet+sheet+music'. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a lure to external 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.com/pify?keyword=humoresque+trumpet+sheet+music
    • http://dixus.nfsupplementsvictoria.com/uploads/1/3/1/3/131378985/zovotoxomu.pdf
    • http://files.wherechangeiscertain.org/uploads/1/3/1/4/131413905/51a14.pdf
    • http://files.themysidiapost.com/uploads/1/3/1/1/131163684/c6d130e6aa4.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/57563176961.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/25684162813.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/yuk_belajar_saham_untuk_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/96560707158.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/36564453442.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/lodixobesakoluketokoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/homonyms_and_homographs_worksheet_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/age_of_wonders_ii.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7735/files/riralukidibip.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_off00007dc0.bin
3b2e73ed23f920f431fa36e9390b64e7c887b5d2c4f8485886b55b8789237ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC0 5016 bytes
font_01_sfnt_off00008eb2.bin
8cf8554ee777836f7e40eeb93bd2cb0b3c6a49d435059ba80cc564b586d80e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB2 18016 bytes

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