Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28e58ad7d78762e…

MALICIOUS

PDF

47.8 KB Created: 2020-10-27 12:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1895951394ab0307bbb793738a234c38 SHA-1: 17cfefb373f2cb602d5f413d8cbbd1f1416abd4e SHA-256: b28e58ad7d78762ed23237ce47ba5263809440d3f0bd496811536304bc54fb8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ttraff.me/123?keyword=starport%253A+galactic+empires In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f93defaaa8d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f9094a37b08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f97d687285ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5f951400a6f68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b4e6b6-59d5-4ce2-aa9a-3f04f79a598c/5641362260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417e8394-186c-4f39-8386-0a87c3112b15/64574085038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eff2c5e-0898-4753-9b13-3e1673b0362d/90823811550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f596a7e7-75d9-4058-bcfd-429046abc4cb/71007586069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f399cfd-54db-4ae2-b1fb-4ea5ce1f65b1/88092675974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/50987190027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3805/5841/files/principles_of_ecology_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/mekuwoxatejagabasela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4517/4439/files/psp_cricket_games_list_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3855/0427/files/wiroratomewevijifosulakab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6398759b-c4f5-413d-9dd6-f030fb26aa55/lagagotejunepaxetotesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3766c93-10ec-4b14-a059-646ef8b781df/69367482097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57395e4a-e629-445c-bf92-f59e8653ab38/49071150347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ceb6d0-1b48-47c3-87ce-1db2e011a8ac/twilight_online_movie_in_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9260/9691/files/my_salon_suite_ann_arbor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/zowamafitovot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4065/2964/files/basketball_club_story_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78db1ad7-8f58-4398-8d00-1f3476e3697a/54467024794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e30dd-03b0-485e-ab12-99576f4eb24a/19316492513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14318d2b-e190-473f-b1b9-e047d9f0c2b8/n_maddeyle_karlamas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b654d7e-7fbc-4ee6-b366-4dce396ad11c/bezesojasifufolexefurenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5af17b5-98ec-4efe-b752-be108a3ff10b/5_second_timer_terraria.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_off00007998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 5404 bytes
SHA-256: 42a6eefebd38698e4e509d5d2f59282928f8d4741a9ef6fb79855d4bac484412
font_01_sfnt_off00008bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDD 11280 bytes
SHA-256: aa3d1d5f91e59854449257b128340645db699468fe8952f63fd8a8d1e9f7448a