Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba635a509dd7170…

MALICIOUS

PDF

40.5 KB Created: 2020-11-04 16:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2478a9fc1be1fd1357567abb589cd0a2 SHA-1: ee38ae04b90178ff6dbf918329ec586b24f6ab85 SHA-256: aba635a509dd717071b3a4394bd82137f91d10bfab62ec4ca7fc43f767393e62
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to lead the user to a malicious site, potentially for phishing or malware delivery.

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.link/123?keyword=2015+chevy+reaper+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f94238c10dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f95e43c20333.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/sugefilitidixomirar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5f98654008f4d.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/nifuwazux.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/398aafe3-e38f-4460-a0de-e0130e351bba/gokowatetufoxosowuserom.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/fermats_little_theorem.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/29516625830.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/spiderman_theme_song_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/toluporupa.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/67151185417.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/initiation_of_translation_in_eukaryotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa976c6-a4ba-4115-9f8c-eb7d48e02885/bluebeam_vu_free_viewer.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_off00006058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 5504 bytes
SHA-256: 35a4a55e28e7289db1da34e34fe3ecfb8135fb7bcbe6f81be025879ddbb34fc9
font_01_sfnt_off0000731f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731F 10108 bytes
SHA-256: f6dbf6d1b6d21458babcbc609dd5e7bbc4351f9a8006b1011e4c066113def9d9

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