Malicious PDF — malware analysis report

Static analysis result for SHA-256 42123113122e2ce2…

MALICIOUS

PDF

38.7 KB Created: 2020-10-29 23:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d54a284442b0e3e9e9736ee4066979f4 SHA-1: 459abda85394342ac65df1dbe1394239a32f31b1 SHA-256: 42123113122e2ce2c02bc3b63dceaaa209ea378f3265c58d05c21d539ed58bcf
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 heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/strik?keyword=square+numbers+worksheet'. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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://ggtraff.ru/strik?keyword=square+numbers+worksheet In PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/5e623.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/6679855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8d715d819cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/zoho_aptitude_questions_with_answers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/business_email_writing_books.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/78703502394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cd9fa8-4d51-41fc-a50a-1f33a873ab58/zurukikugenezipumonumakup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1347/4984/files/9394931254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9362/2429/files/63331060170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfa04fd-8061-4e9c-8cb9-4e4d2b816db5/one_piece_wapol_episode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4112/6077/files/chen_plasma_physics_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/sazisisuwipebu.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/amlodipine_norvasc_davis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B78 5252 bytes
SHA-256: 94c44611226f6282e4cdc9565bd82fd1eb9141ff15d2ac622724f4698b96fc77
font_01_sfnt_off00005d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 10304 bytes
SHA-256: 5e4ef2ebe8c7550c3572aeb82898b661cdd20be155faceaab9a48462438f150e
font_02_sfnt_off00008029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8029 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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