Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a8dbb5021b25b…

MALICIOUS

PDF

70.5 KB Created: 2020-11-09 21:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5d22b5f54e52ea36da649b6ec5605709 SHA-1: 15c6395efdfeb0f6d4a49a136772d3d9d4e2eb97 SHA-256: 639a8dbb5021b25b1a52e1cd1180f6732a3665474d7e7b20baf4df253457acac
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to "dragon city hack pc no survey", suggesting a phishing or scam lure. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?keyword=dragon+city+hack+pc+no+survey In PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/vabezufewawoverik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f9a64c754c10.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/c280b54c.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/xeridibur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8ffb68ca645.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/vugenimonilov-momavojoral-kabitudedababax.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/dajin_doxeduf_bovivopakof_sewozat.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/12a035ab08798d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5f953c6fc8ec1.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/lejivugeleguwod/prayer_request_template.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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 5388 bytes
SHA-256: 780c9e43a3f31151932dead3737dcd188efd1188e85f3b1f24a8d44ac0b92bd6
font_01_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 11888 bytes
SHA-256: 783af53d621b554325eaf35198d762805686c9a0a541a3451224dfd8b686d528

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