Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b68ff3cdfb2125…

MALICIOUS

PDF

39.4 KB Created: 2020-11-01 09:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85721eb3c3036948ce2420231465246a SHA-1: 786d194bba5d1b1ce7c5990e347e3d114f2978a2 SHA-256: 45b68ff3cdfb212576552f5db9de02b33e08746c48be7f7c73b9871f80f3e01a
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also explicitly contains the URL and a call-to-action phrase, suggesting an attempt to trick the user into downloading an application. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://ggtraff.ru/strik?keyword=download+showbox+working+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0498/3357/4555/files/tobiseketufozamagurofumad.pdf
    • https://cdn.shopify.com/s/files/1/0504/6357/2167/files/44989953950.pdf
    • https://s3.amazonaws.com/piwupevivotixi/71614225429.pdf
    • https://s3.amazonaws.com/gidibesuxi/yoga_books_free_download_in_hindi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5129/2584/files/best_android_ringtone_apps_2020.pdf
    • https://uploads.strikinglycdn.com/files/e7958eb2-e302-4732-9bee-2d6a4850d636/what_are_the_5_pains_of_imprisonment.pdf
    • https://uploads.strikinglycdn.com/files/f09b8e65-5e89-4a6a-9b31-32296f1e3022/97286385142.pdf
    • https://cdn.shopify.com/s/files/1/0501/7016/7486/files/retajutubafetir.pdf
    • https://s3.amazonaws.com/henghuili-files2/wenajigixotomobu.pdf
    • https://cdn.shopify.com/s/files/1/0502/5320/1590/files/forsake_not_the_assembling_of_yourselves_together_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0491/8168/7974/files/rikibu.pdf
    • https://s3.amazonaws.com/xovajukoxin/19872510176.pdf
    • https://uploads.strikinglycdn.com/files/44b60278-32d3-4ae3-bc79-bafd4e05c29f/juxoz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bf.bin
a5534b84814e0893dee13f94075054cf618cea143016235265937c091b40269d
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BF 5584 bytes
font_01_sfnt_off00006ccd.bin
9f9586e424118a8b271bedccc6fe57c51265509b062a802b7dd43441fbf9468e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCD 10784 bytes