Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebba4297d2ad51c…

MALICIOUS

PDF

41.8 KB Created: 2020-10-30 15:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5eb3865831e0dca910872d480e91e3a SHA-1: 393d2f38bcf4f51a62d5b7c34905121ac29879af SHA-256: 3ebba4297d2ad51ca453a3e7c1888493f692bd233d8410e81ca81eacfb553b08
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs. Notably, it includes a link to known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=2d+dynamic+array+c%252B%252B+delete'. Additionally, it features a link farm with 26 external PDF links, many hosted on Weebly, suggesting an attempt to manipulate search engine results or distribute further malicious 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://cctraff.ru/strik?keyword=2d+dynamic+array+c%252B%252B+delete In PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/fefinonutulunuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8758ae9c970.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/ragufumakepuxa_musozorelosufuv_rurunufadazif_sakufikizewuvis.pdfIn PDF document text
    • https://vajuwapokovis.weebly.com/uploads/1/3/4/3/134361820/xerumexozov.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/jesasuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5f965883d0c33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/angina_pektoris_stabil.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/anatomy_of_forearm_and_hand.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8924/7399/files/2020_mini_clubman_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/dragon_ball_game_offline_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8947/0643/files/10680938034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6458/9973/files/93198586633.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/insaniquarium_deluxe_free_download_full_version_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B2 5044 bytes
SHA-256: 4f7548cbd31ab93c06f0590fa5df2a221a84a108c07d1fbb294f4acc50369c9d
font_01_sfnt_off000074c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C6 11004 bytes
SHA-256: c5bfb59d4be8c52376b351a6f8525a35b11a2fce8ab62d4f61e56ec170cb48bc

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