Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d77b3b36f29895…

MALICIOUS

PDF

74.5 KB Created: 2021-02-15 18:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f677ebfcd09412d2b31b0eb3db707b9 SHA-1: bbdba4baf65027826cd728ceddd4f950b0785512 SHA-256: 63d77b3b36f298951d0a0a166670c04fc9288f9705700c998137d5573c992da8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to the PDF creation tool and a keyword, suggesting it's part of a link farm designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=dont+fence+me+in+lyrics+commercial In PDF document text
    • http://topidanom.22web.org/bengali_movie_anusandhan_song.pdfIn PDF document text
    • http://amsidgi.xyz/57000964181yunc7.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/gghdger/intelligent_hub_android_version.pdfIn PDF document text
    • https://cdn.sqhk.co/pizibimo/bFjeibH/51471712846.pdfIn PDF document text
    • http://vamoktin.ru/aplikasi_video_di_pinterestih6qb.pdfIn PDF document text
    • http://storeplus.pro/kenmore_dishwasher_installation_videoejfe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fcd65d6e097c.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/lopemobumifaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6026bb4893a89.pdfIn PDF document text
    • http://vykupavto54.ru/zoxovazafofesuvazagufabt4wj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisipusizen.rf.gd/aadhar_card_mobile_number_change_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/amazfit_bip_review_android_authority.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_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 5128 bytes
SHA-256: 3912518829a9fdf159f456602270f72ddf24a25c573c5580ed36e4cac03f3066
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10544 bytes
SHA-256: 1c66b3e3cc4f06b2d1ef36e95e394f073409c1d83a4e2831253cc6fbf0e1873b

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