Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aa0c79e832c096…

MALICIOUS

PDF

39.6 KB Created: 2020-10-05 12:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 91d43a3db45ac24bb67de20387d7fac1 SHA-1: 1a1a19a6002afc71e5a3aaf26bef0b0637594ee3 SHA-256: c4aa0c79e832c096f919790b6f9c8064f674dfa86256c7a25180254a2aaaf95b
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as 'cfp tax planning study material pdf'. The ML classifier strongly flagged this PDF as malicious. The embedded URL likely leads to a second-stage payload or phishing page, attempting to trick the user into downloading or interacting with malicious content.

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://cctraff.ru/strik?keyword=cfp+tax+planning+study+material+pdf In PDF document text
    • http://rovazusem.greybytori.com/uploads/1/3/2/3/132302870/tejumopu.pdfIn PDF document text
    • http://files.warminstershotokan.com/uploads/1/3/1/6/131606128/8049444.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://cdn.shopify.com/s/files/1/0431/5811/0363/files/cahsee_english_practice_test_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6196/0091/files/dasamofefiwosovira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9478/5704/files/contemporary_mathematics_for_business_and_consumers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4939/7657/files/when_we_were_young_letra_passenger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9247809e-3356-497c-9471-79f6c65cde02/wadufixafawovojofuteno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa53a483-807f-4b43-9027-d93d60ee6079/pizanezedigenawikuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72df872-28b7-4913-8b08-699b2eb7dc17/5423750391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150baee5-d7db-4b50-a450-7707fa5ca6af/fapejodadimuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3bf02d-7454-4eee-9090-e4dbcdddea19/41709160143.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_off00004f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F39 5324 bytes
SHA-256: 97ed82cd598985a49c5a5d0ec86d5c3ee2cac8125b0885142b47e93af9eb269f
font_01_sfnt_off00006148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6148 10092 bytes
SHA-256: 389fc64c4ab2d77d1dc6f8a726cc9eebc620e37736b79571d0cfed0c4be8ecae
font_02_sfnt_off000083dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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