Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09c16a4cbe422e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-18 18:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a8d4f1f5da22e8e1ca404e4c3a12a1c SHA-1: 2080cf3992748f9e29fa53ca99c01f51b437eeaa SHA-256: 5d09c16a4cbe422e338c56b95c10e89c0cbf85e7bf09468fdcf3866a2a674e2b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL pointing to known malicious infrastructure, indicating an attempt to lead the user to a malicious site. The presence of a 'download button' heuristic further supports a lure-based attack. While the document body mentions a research report, the underlying links suggest a phishing or redirection scheme.

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.cc/pify?keyword=hester+biosciences+research+report
    • http://files.possibleframe.com/uploads/1/3/0/8/130873839/xebonurunukareb_donolubus_pokomarum_kugeruxudaret.pdf
    • http://files.nevewinter.com/uploads/1/3/0/7/130740221/ripemizirimeje_wokedisi.pdf
    • http://files.kovametalli-in.com/uploads/1/3/2/7/132741535/sudufakopo.pdf
    • http://files.whartonlibrary.org/uploads/1/3/1/4/131438784/3214097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0851/4455/files/anouilh_mde.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/rahat_fateh_ali_khan_songs_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/79031724295.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/upbeat_and_inspiring_corporate_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/nypd_exam_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/94777549004.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/ziwivosezukusolixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/tunemevisomanemuremel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/79089915415.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/wenatonatilo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf8.bin
49c9f73b45fdcfc9b1a6ef6396b810c2fe7a0ae59022b48dc87b48e781f5a299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF8 5088 bytes
font_01_sfnt_off00006d34.bin
f2bce2832ec3091a8842a60afe89f58cc2495a27194f5c46f904fea9f795bb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 10844 bytes

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