Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b42eb282a7e2837…

MALICIOUS

PDF

40.6 KB Created: 2020-10-27 01:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa38164fd3543790904a5b9bd748e69 SHA-1: 7dc3f019f86e996bff18e5bc237132747778be7c SHA-256: 8b42eb282a7e283735641ec698f21b42f6e84aac2973b052d022baa61dcb1436
94 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'fish anatomy coloring worksheet answer key' which redirects to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the embedded link is associated with known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded link suggest an attempt to deliver a malicious payload or redirect the user to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.me/123?keyword=fish+anatomy+coloring+worksheet+answer+key
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/40f93df57.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/pewiredegaka.pdf
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/lipabewazaboz.pdf
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8f39380de0b.pdf
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5f97504e8d6d1.pdf
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f88948867d9c.pdf
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/419fc7adffdfac.pdf
    • https://jinezosibe.weebly.com/uploads/1/3/4/4/134454760/577cbfd.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/supazaxalel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/efd3bf1e-4c87-485b-acc0-2496d5c32b03/gipizumalurevanutip.pdf
    • https://uploads.strikinglycdn.com/files/b29224d4-20e5-4987-8540-5acddccca207/quality_assurance_salary_entry_level.pdf
    • https://uploads.strikinglycdn.com/files/b7556276-822d-4e81-aa19-380d3207a823/93407945859.pdf
    • https://uploads.strikinglycdn.com/files/7f34a4ab-29dd-4840-bef9-ce778643fb7e/riropedukigexavojosux.pdf
    • https://uploads.strikinglycdn.com/files/b7e34f17-7434-44b0-bfff-e143b461bb07/50431500121.pdf
    • https://s3.amazonaws.com/regovadeje/amartya_sen_development_as_freedom_full_book.pdf
    • https://s3.amazonaws.com/joterige/givobe.pdf
    • https://s3.amazonaws.com/jobavo/adverbs_of_manner_exercises_elementary.pdf
    • https://s3.amazonaws.com/baxegezivumi/eccentric_calf_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0266/9530/3365/files/tenava.pdf
    • https://cdn.shopify.com/s/files/1/0499/2889/6674/files/up_nh_hd_facebook_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000535f.bin
34e4c0470fa7ff135ddba23dbaf179920a3ee39bfd9116ef01c12da83e487259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535F 5212 bytes
font_01_sfnt_off000064f3.bin
80cc88cc7a08c2bf323ab517147aeb52147cdab5edeccf477aa3e52306ee0709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F3 9968 bytes
font_02_sfnt_off000086ff.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 4324 bytes

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