Malicious PDF — malware analysis report

Static analysis result for SHA-256 524d9ec8bf7ba2e9…

MALICIOUS

PDF

69.1 KB Created: 2021-01-16 05:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e4170a3cbcdce7a1285c3eab93859dac SHA-1: 76d390f00d2f953cf9d72147dead95a7f90eccaa SHA-256: 524d9ec8bf7ba2e95a59f2c5b886a9e60fd3fd8d6736e15fab2e0a5a51db2537
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious URLs.

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.
  • 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.
  • 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/123?utm_term=call+of+bieber+2+unblocked+4+life In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_6002528bed97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_5fa4637c7bb54.pdfIn PDF document text
    • https://dolivosogokate.weebly.com/uploads/1/3/0/8/130874088/1487911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5fd33b02a6fee.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/eventide_pitchfactor_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fda10771c312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fe36705a0423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f923ae9e83f6.pdfIn PDF document text
    • https://site-1240247.mozfiles.com/files/1240247/14953028244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fabc16a3eb6d.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/satedafadusizo/josizu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/aocs_in_satellite_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/8797302122.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/24813474637.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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 5164 bytes
SHA-256: 4d6b32f8b7c966b590c2e5caa08e5b97c85b3cf8592fb1bb8a39ca312effcbda
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 11664 bytes
SHA-256: c51575f8dfd07520a6f648e3923fa1d3d7104e674483190599d53913ad96f9bc

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