Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd90d504818f88…

MALICIOUS

PDF

38.5 KB Created: 2020-10-31 07:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: df655a3d2e1f0f3c5ddf35ac1726a933 SHA-1: d67ff33bc0abea8fb0b93c18d5f6bab72cd2c4ec SHA-256: 52dd90d504818f88d66b3e2d1481f0d81cf497f2e41c63ee618347940a978556
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://gettraff.ru/aws?keyword=merry+go+round+museum'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of the attack chain, including a secondary PDF hosted on weebly.com. This suggests the file is designed to lure users to malicious infrastructure.

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://gettraff.ru/aws?keyword=merry+go+round+museum In PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/zuwixidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f93739ab46d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f971823db358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8a98f8495c0.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/1/0507/1139/6507/files/lozevakizibinolexuwilipej.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/isometric_drawing_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2555/8425/files/29880072043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3173/5715/files/frdric_bastiat_la_ley.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7525/5968/files/88727077061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0505/4623/files/kiwadezukiwosowajaxabor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9921/7827/files/waveguide_directional_coupler_switch.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44ED 5012 bytes
SHA-256: bee7a1cffa02a5bf66745ad808cfb08a6a8c66cd3214b2b6ce7ec13cc1b3bc87
font_01_sfnt_off000055f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55F9 10108 bytes
SHA-256: 31e909b9d3daaadb05d5614b2a5e20f62071720a45bef043f6697f0bf2f054cd
font_02_sfnt_off00007813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7813 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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