Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f580b2a43396ddb…

MALICIOUS

PDF

78.2 KB Created: 2020-12-31 04:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ca25b6886713f008b6315477511a2f6 SHA-1: 4bd57497535097bc67da737b1aee42aa83a50100 SHA-256: 5f580b2a43396ddbf6d824e99f436ace16790a4e8da31a3d55a3869af394cdbd
154 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 pointing to 'ggtraff.ru'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of PDF redirects often involves embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=2017+mastercraft+nxt20+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fb9f891d46e9.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/jgjgBKe/dining_table_set_for_6_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/mifebemige/jjdjfhM/kezelazibegonabureduwop.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/haggjbh/bingo_calling_cards_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/SmBgjzY/asia_border_with_europe.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/xalasawu/71744877166.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/xazik.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/cat_ninja_project_refresh_game.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/battlestar_galactica_characters_cylons.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/tivirijiguzumuguwagowev.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/kiran_math_book_in_hindi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/32431676564.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10192 23740 bytes
SHA-256: 1cc3b5327bb2aafd53148f059900ce16591044cf2bbc46e3e9d0c95e93c11190
font_00_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 5404 bytes
SHA-256: 81e3741bce197e13a2c0afaa8389897bec20e64aeb5debb4205c199c991e4b05
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 11372 bytes
SHA-256: 2fbddce04716680d5ab282276df8998c03c381f15af02d28d5938b566eaf9c57

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