Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b784b4e1124c795…

MALICIOUS

PDF

68.5 KB Created: 2020-12-23 17:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 899583514166bf4c91715f1b7519e03d SHA-1: 1d1175ede3b127bd4a9fa405a3b21bbf7b8b9682 SHA-256: 1b784b4e1124c795decb2fc11ca4b6f50512bd375482136d0fa83e4eaaeada5b
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to a 'hamster house game hack'. This indicates a phishing or malware distribution attempt. The presence of numerous external PDF links also suggests a link farm, further supporting the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=hamster+house+game+hack
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/79f75f69d2c2.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fb769ca8e5b9.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/todoluranefix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20d5ea41-8686-49f9-bfca-ad6f0357b07a/cracked_netflix_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/83955b38-751a-484a-afa3-1a1d8f931187/14286599516.pdf
    • https://s3.amazonaws.com/bezegoluzose/angsana_new_bold_font.pdf
    • https://uploads.strikinglycdn.com/files/6cbc6d8b-2454-4a9c-b43c-bfd76e26e9b0/16133573961.pdf
    • https://uploads.strikinglycdn.com/files/58036229-e9d1-4be0-ac7f-c8ac199bf4e2/85583565128.pdf
    • https://uploads.strikinglycdn.com/files/047cf624-fc23-4e57-af78-e3c0dff3aba1/ddi_utilities_spy_apk.pdf
    • https://uploads.strikinglycdn.com/files/83b696ff-5241-4110-99fa-56ffe0fcbaa6/gisutarifulakalokepi.pdf
    • https://uploads.strikinglycdn.com/files/78a23367-4734-421b-90c9-deec3df31fe0/kapebavesaxa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d081.bin
14ff08f1c95364871d8752445cf75cd7c9ee89d43715a6e5a12685ddf5e097f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 5208 bytes
font_01_sfnt_off0000e20d.bin
818d2b4994e252fec004b7b22771b5c6e62ae1a0669b95186f46cf0b9d39f7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 10544 bytes