Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae123c602e65c913…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 12:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aaee7ccdef6f3e7ef644c05731dd100 SHA-1: 7bb8bc6a0ab3a80a7eabd1497c630b46ce08e048 SHA-256: ae123c602e65c913cd92f8e8076fb3063d500c06237fe449ea63e7cc1815912a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=high+school+report+writing+format'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0429/7093/9541/files/pulelali.pdf'. The document body, though heavily obfuscated, contains these URLs, suggesting a lure to external malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=high+school+report+writing+format
    • http://files.dulwichmindfulness.co.uk/uploads/1/3/1/6/131606261/zonovoxanof.pdf
    • http://files.kewaneejobs.com/uploads/1/3/1/4/131408664/3c72a997.pdf
    • http://files.plan-my-trip.eu/uploads/1/3/1/3/131380485/vuvowizoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/pulelali.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/2868962586.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/crash_jerry_spinelli.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/taraxixinuzudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0274/files/kuradesinebazuludaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/albino_rhoa_feather.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/azhakiya_tamil_mahan.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/bad_habits_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/antonio_candido.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006210.bin
e434f3ca2cccb74a6e5c94d2eb8c8b17fdab8b3cdc0bf5d443afcfc6cedde8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 5480 bytes
font_01_sfnt_off00007494.bin
ffe29a8f01a7088edaa568539a304b8f390c1759cfed7a4a0d68d2752af6a10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7494 10004 bytes