Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ecef7ac466c07e…

MALICIOUS

PDF

69.4 KB Created: 2020-11-11 01:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9273bf40f69cd6d17247bb1a4a8d86d SHA-1: 9c532880e93063cb71d538a19d60a2ec27c80e4d SHA-256: 25ecef7ac466c07eb687a95fc76883e09f208159cc8236bf363ded6929ff9eb7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?keyword=curse+of+insanity+witchery'. Additionally, it exhibits a PDF link farm with numerous external PDF links, including one to 'https://uploads.strikinglycdn.com/files/f3c66615-10c0-4b9f-a68f-298f4ad16b06/survivalcraft_2_apk_free_download_full_game.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?keyword=curse+of+insanity+witchery
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f8e59939d210.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8a4d5e55dff.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/c4001091001fb9.pdf
    • https://zatetemaf.weebly.com/uploads/1/3/4/4/134494585/dejag_boperuvuzato.pdf
    • https://wejuvizir.weebly.com/uploads/1/3/4/3/134395749/rutamerorewinu_sifigonuzine.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/6029863.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f3c66615-10c0-4b9f-a68f-298f4ad16b06/survivalcraft_2_apk_free_download_full_game.pdf
    • https://uploads.strikinglycdn.com/files/2d594676-ea77-4baa-87c7-44103d91a9c4/mejaluse.pdf
    • https://uploads.strikinglycdn.com/files/bef9eda1-5ecf-4066-bd17-3d1aebe9ed33/go_vs_python_lambda.pdf
    • https://uploads.strikinglycdn.com/files/bafacf0e-2b32-4521-9590-10238ebd35f3/62660012372.pdf
    • https://uploads.strikinglycdn.com/files/50cfe1fe-c801-4252-ba44-f259a20bd3d0/53478705992.pdf
    • https://uploads.strikinglycdn.com/files/6abb2cb8-09ff-4047-abaa-8cbbb4566746/nineritijusumov.pdf
    • https://uploads.strikinglycdn.com/files/06f24ea3-48f3-4178-8339-7720944b7d9e/9963966771.pdf
    • https://uploads.strikinglycdn.com/files/724b474c-8841-4451-8b20-16cf2573543a/12468869672.pdf
    • https://uploads.strikinglycdn.com/files/4a79caad-7832-41ed-b994-cbb8976f164c/podujafagukikoga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59d.bin
4758f02c4cef30f5f6dc4b21a1a3d5b2d474f5a198e28d620ac1f0194603a002
pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 5036 bytes
font_01_sfnt_off0000d6d3.bin
b9577c77c8e8a6474a00089b39ca363085ba127995bccdce11ba0f7c8a63d84c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 10496 bytes
font_02_sfnt_off0000fad4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 4324 bytes