Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd82a3df4ea08d02…

MALICIOUS

PDF

43.0 KB Created: 2020-10-17 04:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a59cf857f20aea0a63cb43882ddd31be SHA-1: 20af8b398f8c04ae5c5b5b74aec924e3a79adaec SHA-256: dd82a3df4ea08d024ffa5d78f167f764f6493390533fe411922315d5ee0d16d5
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to gettraff.ru. This URL is likely part of a phishing or malware distribution chain. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are PDFs hosted on CDNs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/wb?keyword=srs%20audio%20sandbox%2064%20bit%20%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f874013e4014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f891930a875e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f870b1485849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8754224d9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f87ce870b9a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8a230bb8d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8a1597284d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8829c9cdb55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8a10fa8c732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f871bef817d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f8a1193481b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9825/8073/files/watch_the_greatest_showman_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/sharp_portable_air_conditioner_cv_p10pc_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4110/7353/files/zanuwid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/kinematics_physics_problems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2024/1064/files/mary_kay_starter_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5391/4530/files/phonics_worksheets_grade_1_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1435/7151/files/mufenigiriwulepef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3730/7292/files/goturojuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220a86ff-5fbf-4ecd-9436-b8d6ee035281/84247217168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf6db4d-b933-452a-9ee5-5a42924a73dd/jugukaxurewirikivivize.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_off000063da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 5972 bytes
SHA-256: 173e11c57635093833d64e5d38fc11373a3b3ba5e58cd346c9b5b2fd484255b6
font_01_sfnt_off000077ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AB 11100 bytes
SHA-256: 161f78a7e148e5b8754f454c159b420f6cffd72876dd9d7a1d3913df2f6a24fb

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