Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd05f3f4ed36025…

MALICIOUS

PDF

101.2 KB Created: 2021-01-06 01:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 74d298456a300162069d3159e83de577 SHA-1: b1191695b574b579150f32ada2621c493c1d89f0 SHA-256: cdd05f3f4ed360251af7a0667111543c3f91e2b855b27474f02cd8f5c2146387
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of a visual download button lure suggests an attempt to trick the user into navigating to the malicious URL, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=college+chem+lab+report+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fa731d709837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f89ece4db064.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/48ibnjb/11129994677.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/77a94e4c-b0a6-4607-a1c7-272c8a06ef61/tizevubojinavosiluzop.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/xafukapadaziged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e801162-1195-4487-8878-8689a245821d/jailbreak_my_iphone_3g_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de64c795-ebc2-44ad-9873-9573fa04fc0c/mitchell_high_school_tennessee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb768e4-5f6f-4d01-aa1b-a13724c717fe/singer_tiny_serger_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39b4a14-6d25-489a-b619-52a3868580e8/73569515135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1004665-dba2-4164-a6d1-85c40bd7f916/49717666765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14d878a-c1a6-439e-a5d4-a4600eeb8e8a/73363660390.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_off00014d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 5296 bytes
SHA-256: 39ced771239a9adf69b17daaaae45caa1896c56004940a8b2c2e5771e9e9dfe0
font_01_sfnt_off00015f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2A 11980 bytes
SHA-256: daaeaa9f44b2fef0036bfccd31c7f1b00ebf8f1802d6d12110452d1b83f865df

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