Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f528c62beed2c98…

MALICIOUS

PDF

108.6 KB Created: 2021-03-01 17:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 969c0a599f01ef00da38a3beba834f76 SHA-1: f3fc82983bcd01820a95296173baad51faca0d06 SHA-256: 1f528c62beed2c98f0bc315c14626f7ab6ca2320ce470d6590be211d822c20c2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://yafferge.ru/wix?keyword=reaper+user+guide`. The presence of a 'download button' lure and the ML classifier's high confidence score further indicate malicious intent. The document's structure and embedded links suggest it is designed to trick users into visiting a compromised site, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=reaper+user+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60120e571ff4e.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/89799479137.pdfIn PDF document text
    • http://passive-income.ru/tazulabanolole13owb.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/irulu_x7_specifications.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_6032f24e2574b.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/how_does_a_lennox_pulse_furnace_work.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/mizexadafitosox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fffa2015d210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5ff62010a2ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6017184f8be2c.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/what_is_life_coaching_icf.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/how_to_learn_phrasal_verbs_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_600a733a263cd.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/the_giver_chapter_10_11_quizlet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratobewiwigu.atwebpages.com/32832060136.pdfIn PDF document text
    • http://domuromu.atwebpages.com/salikixapibif.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_off00016ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF6 5104 bytes
SHA-256: 2073f50f8091e491a3ec566b6296292a25837de4b36435eeb0fceeef43c3427f
font_01_sfnt_off00018164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18164 10732 bytes
SHA-256: 6bd99c55b4979627fb5af461658de7a11237ba13c388ff8071dd555ce86bdc1d

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