Malicious PDF — malware analysis report

Static analysis result for SHA-256 99707a4e84e43325…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 04:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bfe87373d86777ad05464c08cc118865 SHA-1: edbf0b22fa02ef211c9d4d23cd69f5798266e71f SHA-256: 99707a4e84e43325721ecbdc583032676bfb628c2a3be1e6dd728cf4ee24bb1e
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at 'https://cctraff.ru/123?utm_term=apk+minecraft+pc+windows+10'. The document body, though heavily obfuscated, contains text related to 'Apk minecraft pc windows 10', suggesting a lure to download potentially malicious software. The presence of a link farm and the ClamAV detection further support a malicious classification.

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://cctraff.ru/123?utm_term=apk+minecraft+pc+windows+10 In PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/sipegedesiridep-tipoxuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f9906c32b0ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5faebcb055925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5f97dd4d0af19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5fa09d04834f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5f96eafd21a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_5fb2eaaec1507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_5fb94403b7dd9.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/fdcf66f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fb8896ec2256.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/vavale/85250918666.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/fojesoparebizogazomunawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788ba999-c055-4ed8-80db-fe5a5aeaede9/cthulhu_board_game.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/nuclear_waste_management_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/18067495882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0b2851-33fa-4f76-a33e-1231c18ad822/walusitadoranujisiguzo.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 5608 bytes
SHA-256: ea7e517fa172846f8539d467cddf81c7883593368e64f4784075372eb6673981
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 9876 bytes
SHA-256: e9fd17295622d43c08604dae234020d0a71c5bb985a431a4f731d0b5b2558475

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