Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8671a777589f18…

MALICIOUS

PDF

80.3 KB Created: 2021-01-03 12:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0e76ce7512638f679646b2c451f62e65 SHA-1: 3b66c9f2fdd43a668897cadc37bab00899a36864 SHA-256: ae8671a777589f18447443a65c1a62823ae4cab04d336864c285e41cf3786f6d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains embedded links to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the primary link directs to 'https://gettraff.ru/aws?utm_term=uc+browser+app++link', which is a known malicious domain. The 'PDF_SEO_LINK_FARM' heuristic suggests the document is part of a link farm, with one example URL being 'https://s3.amazonaws.com/pokixovuxik/epileptiform_meaning_in_marathi.pdf'. The document body is heavily obfuscated and appears to contain junk data, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/aws?utm_term=uc+browser+app++link In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fe3ab47c4c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fdcb57acd921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fc112c040c29.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ial4hf0/police_helicopter_simulator_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fdac617813eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417526/normal_5ff12051444f9.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/e4fafee1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fb8efa512e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd7b42bd25e9.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/pumuludoxidog_xuvoduwafivu_xatiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/epileptiform_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/hotmail.com_login_email_account_inbox.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/refovexevir.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/xovanu.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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 5212 bytes
SHA-256: 445d202a2e051cc6a517a753e21fd3b2e00dbccd5193e5b3c1904057a5a51c4e
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 11068 bytes
SHA-256: a5fd2e79d8af2fc1a6e3f519fc73d74762f416a744f29b9a3584cc7bbe8dafdf
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 16444 bytes
SHA-256: 3175b01a6d47688e2e3e48d5e88dac485f0053d9b270d938f90ca58da7666114

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