Malicious PDF — malware analysis report

Static analysis result for SHA-256 590501524ad41863…

MALICIOUS

PDF

39.9 KB Created: 2020-10-29 22:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd2bb99ec77609b20db155b5fc8ec617 SHA-1: 909bf60daef4f411158f247c23ccadac80cccb61 SHA-256: 590501524ad41863f3d4bfa7e69ac3479c976cacdee087d35ddea0bf56234398
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 critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?keyword=browning+buckmark+grip+screws'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link suggest an attempt to lure the user to a malicious site, likely for phishing or malware delivery.

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/strik?keyword=browning+buckmark+grip+screws In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f8fd1557bf56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f91d9927b913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f874012d2fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f876631cc3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f89829e4e8f5.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://uploads.strikinglycdn.com/files/0fb3794a-3b35-4022-b800-bcde357cbc9d/22400259145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a644bb2-8604-42de-a142-c8a1250b3f58/ejercicios_modulo_de_young.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1479c2b5-321c-43c3-8c44-f6d9a644c57e/43237623609.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/a_little_history_of_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/vexusasojukojaporurigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5935/5041/files/vanguard_retirement_planning.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/workout_programs_for_mass.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_off00004e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E49 5368 bytes
SHA-256: 71eb5e992967e1428ddd4550c00e4e7d7ec33966a31d0d0408133dac31303825
font_01_sfnt_off0000607a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 10680 bytes
SHA-256: f10ff74165fb5da553dba293c304160c7d6c271c570bbcff46edc2cf71763efe
font_02_sfnt_off000084f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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