Malicious PDF — malware analysis report

Static analysis result for SHA-256 6798297d288a7235…

MALICIOUS

PDF

51.0 KB Created: 2020-08-23 08:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc49716f9360f4ade1b0cb6ffa76055b SHA-1: 600b26a984fdc73b25c7512c9b507ff806e5a581 SHA-256: 6798297d288a723580193de22a057319e40caadede864c8967a762a04d9f175b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. This URL is presented within the document body, disguised as a syllabus PDF, and is intended to trick the user into clicking it. The presence of numerous other PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO poisoning attempt to mask the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=cen+01%252F+2019+syllabus+pdf
    • http://rawozeref.debbieyoung.co.uk/uploads/1/3/1/4/131406798/8193974.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/lopisolulabutavasopevug.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/jojigavaxozet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/sylvia_s_mader_biology_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/kazijiwepemevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/agency_problems_and_the_theory_of_the_firm.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/2427263128.pdf
    • https://cdn.shopify.com/s/files/1/0465/8724/8805/files/best_free_blogger_templates_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/allelopathy_in_agriculture.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073d2.bin
0720c603f581e84e64f9cbca9810ab3ce8c740d36f6657ebba1c07d32a379cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 5604 bytes
font_01_sfnt_off000086f8.bin
559f49cbba28445d62dd28b0ece6dc02d44dc7fb8733d6f00f48b44a93b7c949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F8 10456 bytes
font_02_sfnt_off0000aaa8.bin
98cbaa80be310aeedeebdde107ab6c85af843305496d9da06e9b8de8231e0e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA8 5676 bytes

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