Malicious PDF — malware analysis report

Static analysis result for SHA-256 868a752352ca8e23…

MALICIOUS

PDF

52.7 KB Created: 2020-07-23 02:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba32a2e3ba564d901567ac8a6947468 SHA-1: 0d7e68e81f8404346ad051963a0eab412774a22b SHA-256: 868a752352ca8e23be720321520e73bcde4b9391297c53ee61069f1178e2a3fb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'quantum mechanics handwritten notes pdf'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which are to benign Shopify domains but also includes several unknown domains. The ML classifier strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, suggests an attempt to direct users to external, potentially harmful, web content.

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/wb?keyword=quantum%20mechanics%20handwritten%20notes%20pdf
    • http://files.sierranevadapork.com/uploads/1/3/0/7/130776327/pexilimubibexagasuta.pdf
    • http://files.leoinyourkitchen.com/uploads/1/3/0/7/130739810/xipolotogi-ruwawuve-surejeme-kakisiz.pdf
    • http://files.stevecrowhurst.com/uploads/1/3/1/4/131454090/6531768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/tasemasawiranalomebaxube.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/87625275833.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/pepitutineratejenexat.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4206/files/15512255896.pdf
    • https://bewonaten.files.wordpress.com/2020/07/83734824975.pdf
    • https://ragetefuka.files.wordpress.com/2020/07/12077378337.pdf
    • https://sexedituf.files.wordpress.com/2020/07/jodokulukasatunoleleleje.pdf
    • https://dekelemogi.files.wordpress.com/2020/06/funitugarimon.pdf
    • https://manisesemumi.files.wordpress.com/2020/07/52619458720.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6010/files/jivolevirowegarazoxej.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/42403660270.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/31863273964.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/zefal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/21029153727.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/napopotitegakamekufebab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/18286700978.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_off000082ec.bin
b3365b5f4f681bbc6395c6e96b6f4373db33b8b706335568e991d4ad744324fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EC 5396 bytes
font_01_sfnt_off00009520.bin
a47e8f676be2b814a429f4d18b68ee788cee2d2bab53755ed2ee59c643683543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9520 15504 bytes

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