Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdb1a37d4a05723…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 11:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e9ff8576b584d5fa77b718c80ba9c608 SHA-1: 3ea0eb49eaa789aaa076f84d7113388d42c99ce8 SHA-256: 3bdb1a37d4a057239427636fda2b3798a2b03a622e99bd9ee825d6830f7901da
102 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of a 'Download Button' heuristic further suggests a social engineering attempt to trick the user into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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://gettraff.ru/123?keyword=nikon+manual+z6 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f9de2cf731d6.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/libowebujakux/psychology_101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16aeafba-64da-43f5-b85f-37eb3034d123/far_cry_3_new_game_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdd13aa-a4bb-429a-b565-83a8c7fd2f3d/22709101293.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/cat_backhoe_operator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/506_assignment_answer_in_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/kamunakazefebotanix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a2322d-4882-4cef-ad24-5668b01c31e6/99013935516.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/naive_set_theory_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25a3785-ea4a-42db-8265-64123ec112e4/18k_gf_l_quintal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540aabc1-4194-4fe0-897a-b46f8cabe688/22532138111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f8eca0-16eb-433a-b094-ec73d41608f2/skyrim_se_lighting_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d3c26d-9049-4421-94e3-3173682c1087/gugujezarexujukekeja.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_off00005efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 4796 bytes
SHA-256: 6b9f1e37fed6cd9ad523a125f017f39c5af0bd3bae12d30dde581b22cb375a7f
font_01_sfnt_off00006f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 10760 bytes
SHA-256: 84bcd79290340d47c34d876134e4bf41eca667eed7d43a9a42ffe896d2b57c1e

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