Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efd3f8c55575980…

MALICIOUS

PDF

74.9 KB Created: 2020-12-30 12:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c8ba20bc0b9396365245bf9a2a3e77bc SHA-1: d3bafc37ad5aa8330bdb4871245ee7cbdf385bdf SHA-256: 6efd3f8c55575980929312d81b5a2537cdacef2591e9b0ffd79e33a2c5ffe087
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=nth+roots+worksheet+answers'. This URL is known to be associated with malicious activity. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=nth+roots+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fc4cc77b3fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fa7d91cf3cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5fb5175ccf46e.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/ejhOShb/chaos_heroes_warhammer_total_war.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/flgcfhd/dasavagavegunur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fc35e3b6511e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8eec9426c67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5f91c43f52284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8725624b64a.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/2a5ad0b7-d474-4d8f-9b71-c12e4be1d37f/xenike.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/25748820788.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/aha_2018_lipid_guidelines_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f1ce50-c094-47a7-a34d-958e7b60cd97/92641591928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fecc047-d213-4951-94e3-bb4131f5b65c/78296877006.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/low_back_pain_icd_10_dx.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 4604 bytes
SHA-256: 3ce118e61dd29b095387c82dcde5d38f34eab3172f455d4a2d72f2ca445a0948
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 11052 bytes
SHA-256: 7c18ce68f2714a862b512c5f16ea10bd45177e2e714a5a44824be52468bb881e
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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