Malicious PDF — malware analysis report

Static analysis result for SHA-256 9534becdc5af8d86…

MALICIOUS

PDF

72.3 KB Created: 2021-02-24 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2120fffe9c227a1a3c8b13cc0c1ebbbd SHA-1: dd38ecfa87ad5b6651f045d5936043c935592efa SHA-256: 9534becdc5af8d866bc9e44e22de3015ef03ada0da72259e1f9e9f3c750dbd66
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to look like a search result. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure. No scripts were extracted, but the primary attack vector is the malicious redirector.

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://yafferge.ru/strik?utm_term=how+to+do+the+thanos+snap+effect+on+google In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5fe36bec357db.pdfIn PDF document text
    • http://mailedflkf.site/design_thinking_process_mode_guidek1e0c.pdfIn PDF document text
    • http://healsmall.space/how_many_wings_of_fire_books_are_there_going_to_beq7u5j.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/5731109.pdfIn PDF document text
    • http://kawlites.online/toefl_exam_pattern_and_syllabus2u2ri.pdfIn PDF document text
    • http://vemafenuxaj.22web.org/bibuvuf.pdfIn PDF document text
    • http://coolmag.biz/94929914793td3ze.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/fuwajidiwuvewona.pdfIn PDF document text
    • http://fegebekuxew.22web.org/nursing_books_online_free.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/murudute/46556390991.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/vawonuwutiwizojaveje.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/lucifer_total_collection_report_imdb.pdfIn PDF document text
    • http://votofeki.epizy.com/77605878108.pdfIn PDF document text
    • http://sumorililuduj.epizy.com/tejigasabaluxoka.pdfIn PDF document text
    • http://tiwojojerat.rf.gd/19188583713.pdfIn PDF document text
    • http://sasomibaben.rf.gd/fisher_price_jumperoo_animal_wonders.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 5376 bytes
SHA-256: 8dcf9f1953abb0eafd61ead19c3285a99da42634c903d663cc219d77509266f5
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 11352 bytes
SHA-256: ecd27eff53947f23a59fc9e9e0c3cfa86e5207f116385912565d1b66c38e7f5c

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