Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a437a025e4a5bde…

MALICIOUS

PDF

63.7 KB Created: 2020-12-22 00:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 20d3d93ddebb815f69e49bb23febdc3f SHA-1: 433d2231599d7f461df48fa3176de624f0d2ca70 SHA-256: 5a437a025e4a5bdedf2636f8e9bd2e2f369bbaca8718ae98e66f49f1ddd98409
162 Risk Score
Tags
free-cdn-ebook-manual-lure

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 'traffmen.ru'. This URL is likely used to host phishing content or distribute malware. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL and the document's nature as a PDF suggest an attempt to trick the user into navigating to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=the+warrior+top+stickman+mod In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_5fbb63dfbbf87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fce5ab0d7ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5f9f14509d815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5fadc1c959ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8d9820eb109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_5fa385253f3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9e8d5692c19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5fce8e081aaf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_5fbcbf14e7482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b7e378-a5bf-4bb1-946d-f1171e8a15c7/firegixewasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9335cfdd-b45b-4ad0-8402-e6f4dde48d80/pujuganavevilexirev.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/tiefling_skin_colors.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb643555cf06a6d12d55b/t/5fd161ceeeaf2774ac7f4d36/1607557583474/willie_nelson_songs_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846aa376-382e-49d1-a903-4e887ed8031f/sigaluzagup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc587d711f6a41984a50d48/t/5fd037fa0c0c9b10ab00c75b/1607481338566/luwoxigoxasozuvejepevakuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 5388 bytes
SHA-256: 1a5fadce07e1833adda4df007d515a13535af685f4457b25da7bc46c8fcbad76
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 10476 bytes
SHA-256: b98aa9c8406819593a40eacae5513a59fad39651e5e23dacf76e05a42808fa54

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