Malicious PDF — malware analysis report

Static analysis result for SHA-256 77665bb778c6fdee…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 13:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 843ac1e0c64ba44168981d518ea546e5 SHA-1: 1283e18e921c82dc5f56dca6fd05bd3d8f78a9a4 SHA-256: 77665bb778c6fdee6dc32e4a70821e4cfeb951f6b066c0e0266a30e12da1f6da
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and references educational content, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content. The primary malicious URL is 'https://ttraff.cc/pify?keyword=5th+grade+math+common+core+practice+test+pdf'.

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=5th+grade+math+common+core+practice+test+pdf
    • http://keviti.inspiredbybaking.com/uploads/1/3/1/4/131438079/2944533.pdf
    • http://files.eskotrails.com/uploads/1/3/1/4/131453429/dukud.pdf
    • http://files.kathrynmeganstarks.com/uploads/1/3/1/4/131438761/1169360.pdf
    • http://files.vincentstokesartworks.com/uploads/1/3/0/7/130775727/nomakanolefo_jalid_gejodete_puvolepamufem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/dapuvejijapub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/36198163752.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/87434751137.pdf
    • https://cdn.shopify.com/s/files/1/0439/6885/6222/files/minecraft_mods_for_1._8._7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/bisugusumunokij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/wilatazawozitakoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/daily_attendance_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/bewatakoruw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/best_teas_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0133/files/30338321726.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a38.bin
00ee703b544a932ee1030070c84f66de6c5e046f3e3760819a9c5ad75ed39f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A38 5356 bytes
font_01_sfnt_off00007c43.bin
395bb9c005802df72a10f9f88f289f95aad2c932a7db92657811e89afcf062ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 10112 bytes
font_02_sfnt_off00009ecc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECC 4324 bytes