Malicious PDF — malware analysis report

Static analysis result for SHA-256 55acfb58738b4643…

MALICIOUS

PDF

75.6 KB Created: 2020-12-05 04:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cb8c0016a46d7e7cd7500684393b016b SHA-1: 156b75c87db017cd38507514933b08c1aeec7918 SHA-256: 55acfb58738b46438ac4a64f4b0281a8fc24d350d21d2d8ec3e61e3987891c2d
154 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 'https://gettraff.ru/123?utm_term=boston+university+aba+509'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Boston university aba 509'. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=boston+university+aba+509 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5faf5227985e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5f8c8c7d6c07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f8d626ed1d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_5fc0b6c21a85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5fba69fe49b8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489032/normal_5fca0477ed375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc4761a02c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5f9676f0b7e3b.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/79a590f0-eca8-420a-a783-c4f345c340ec/38680146982.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/31071364019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6285eb-d554-4e34-9744-72f734405d2c/ninisoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3f39a3-ce65-42a9-bb85-112fd21efb2e/sovawilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa2eb94-b0b7-4486-bc7f-9d5785c77570/ap_euro_curriculum.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 5304 bytes
SHA-256: c842c17451015bd0a5560c33e5b82d5f3105c4f778aa235f134d4c80f8004270
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11408 bytes
SHA-256: d4115185c6d503b0f106b8fe0eb0ff597c337d06e68d4dec95bed6b6497b22b3
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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