Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faad77e6df6a653…

MALICIOUS

PDF

81.0 KB Created: 2020-12-18 12:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2e753116877746929fbafd369f5810ae SHA-1: e9b83b58ce445ee10b253d509ad8bae439d9ef54 SHA-256: 4faad77e6df6a6536f64c5f9e4da28899e070e4bae9f77b224450d663e94b761
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 'gettraff.ru'. ML classification and ClamAV also flagged the file as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload. The presence of embedded URLs and the redirector link are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=absolute+minimum+and+maximum+calculus In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5f9d54c5643ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_5fba6a4bec74a.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/4eef2422-f391-4dcd-9764-303be745b0ea/35761588812.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52f513398ff751549c769/t/5fc71fcead3e6411923f4d42/1606885327164/jifufudunoduganebetolazig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce66d0f1fc5b0afdab7e3f/t/5fd20f128185f4776a13fd37/1607601939446/air_force_special_operations_officer_salary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66fe517e72026400ff170/t/5fce9262582dd45c7f37b768/1607373410605/46339898532.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc693058139af03766c457b/t/5fc807e1234f70360a9c3042/1606944737418/somabipujetopekifuzinoji.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cb83cb936d6a06a53c6c/t/5fd0e8342d486834acb17c71/1607526454571/guess_the_bollywood_celebrity_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d180ad-6237-4d18-8408-3a0ab41b64df/68908247025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b2f2d2-68c7-4ddf-a46a-1c45a1651ab5/3594918567.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 5188 bytes
SHA-256: 7890f114d681d555d58de4cfcff48561c287181dba33b6a285944fe189dc68a0
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11636 bytes
SHA-256: f47e77fb0403f756bc504a1ee892b55d0b58e589dec5a866edb46c5635146e66
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16392 bytes
SHA-256: b182103b2075bb99ef41a5eae44f0d40d0e107dc6eebafbb6c7645c6549e839a

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