Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc962c8bfd8627bd…

MALICIOUS

PDF

38.2 KB Created: 2020-10-01 12:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a38891c8021112bc2eb4e2b9c5853aac SHA-1: 78fa5d1c34cc60d83aabbdd68f19a30c09294c25 SHA-256: bc962c8bfd8627bd98837df176565a8e6f10b5357085a8f6f73b26741a45e0fa
124 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially obfuscated, contains text related to 'technical aptitude questions' and includes URLs that are part of a link farm hosted on disposable domains, as indicated by 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user through a deceptive document title to click on malicious links that likely lead to further compromise.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=technical+aptitude+questions+with+answers+pdf+free+download In PDF document text
    • http://femonapef.givingasha.org/uploads/1/3/1/6/131606113/jepufaremaxubidubos.pdfIn PDF document text
    • http://files.redpillsentinel.com/uploads/1/3/0/8/130813692/majar_likoj_nusuvixazijusem.pdfIn PDF document text
    • http://ximalaluw.cinderellacares.org/uploads/1/3/1/4/131407408/lenumagofet-wabiz-bulizalevabe.pdfIn PDF document text
    • http://files.fashionistastudiovictoria.com/uploads/1/3/2/6/132682039/ludavuxulex_jemateloviv_kujotuwogaf.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/ropovowilawizitun.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/27758637252.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/80367472296.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/wobexeran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a354ae-dfb5-4a79-b280-6a03afb49544/xakeduzapavunadubine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed9ae23-0530-47aa-973d-8400f6994355/gazosuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b15229-df72-48ea-b206-cb0411aba5af/ramelot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4370d46-5dab-4ae2-844e-82804e5025d1/xiwawenekutekiduluxuxuluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8fe600-9972-4498-944a-b68e1d6c6709/79581465056.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_off000055e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55E1 5408 bytes
SHA-256: 2a03a84dae6eb7c0c5633e2802452257238292ae224ac107276f7175de1dc779
font_01_sfnt_off00006851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 10380 bytes
SHA-256: a907327249afa583815da35608c16ccbab45bc2308c6598d7c5eaccf60eb621d

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