Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b68c62d4ceb769…

MALICIOUS

PDF

65.8 KB Created: 2021-02-14 20:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a23a9538d6fe811d05b89cbd02c6dcf0 SHA-1: 2a0ed3ec95a777ed15f4d0d9d3c35222dfbfb62d SHA-256: d4b68c62d4ceb769ded14316253be0349092bc239550ad7f70968a378c07161d
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/wix?keyword=character+analysis+worksheet'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a compromised site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=character+analysis+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_6028fcdeaff90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fe5d88ca4d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5ff5005c312d4.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/Nhcjewj/tiktok_songs_playlist_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/4hisljf/arduino_ftdi_driver_linux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_5fd9817020968.pdfIn PDF document text
    • http://nikaold.site/facebook_app_for_android_4._325uqd.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/hbigGvu/knife_sharpener_electric_reviews.pdfIn PDF document text
    • http://namelesssouth.xyz/let_me_speak_to_your_manager_meme3ljax.pdfIn PDF document text
    • http://jumbochecker.com/kaku_causative_passive_formx1cqd.pdfIn PDF document text
    • http://indital.fun/calendrier_2019_et_2020i1c08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479917/normal_5fdf3a46c9995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fec3ceb7c4ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fcc3d4b498f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_60192f65e386e.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/bQicKol/76078580785.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/diwitapezu/likefasenoxobajaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/sslc_maths_model_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/jovefofem.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/74051793235.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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 5052 bytes
SHA-256: ef7057008fc25a9d02b75c40e35cc77bc4c316c37104a2920ec0a62e8eb7a592
font_01_sfnt_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 9884 bytes
SHA-256: 2a7cd085ef4d64862fec7612c9e5d4eaf94576c9bcaf9d4c82086fdb34cdf39c

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