Malicious PDF — malware analysis report

Static analysis result for SHA-256 525ad61519a54167…

MALICIOUS

PDF

52.3 KB Created: 2020-10-03 05:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4172edd1b97ed11a94be25790e61fc54 SHA-1: 6f81195c2d14eccebf04f53703e5ebe791ea8231 SHA-256: 525ad61519a541675f7402d3b776307207a260fcd0c63a7a2539c3171248a33d
132 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains links to known malicious redirector infrastructure. The presence of a visual download button and the embedded URL pointing to a redirector suggest an attempt to trick the user into downloading a secondary payload. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/pify?keyword=the+obstacle+is+the+way+epub+download In PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/jeninajewupamoxeva.pdfIn PDF document text
    • https://site-1038879.mozfiles.com/files/1038879/11779051051.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/27633486767.pdfIn PDF document text
    • http://files.seattlesurgerycenter.com/uploads/1/3/1/3/131383914/tedumanasamid.pdfIn PDF document text
    • http://files.beerandwinefiltration.com/uploads/1/3/1/4/131454255/9313ad572de993.pdfIn PDF document text
    • https://site-1039562.mozfiles.com/files/1039562/bukosurikik.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/35404469108.pdfIn PDF document text
    • https://site-1041501.mozfiles.com/files/1041501/6759796625.pdfIn PDF document text
    • https://site-1042931.mozfiles.com/files/1042931/58402701472.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/futaxafofuziri.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/d4ad88aa-1d67-4fe3-81b0-067d5f87b256/fatupupomaledawebufilof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e877c0d-fea7-4194-a45b-9678f77fc667/pufaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d13168-aa34-42f9-af8c-b59387a9f69a/13985599387.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_off0000816a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816A 5348 bytes
SHA-256: 4ea159e8e6b0714f32056f29e3182a7ea96e7ed4b840c15cdcf81c401d3712a4
font_01_sfnt_off000093aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93AA 15700 bytes
SHA-256: 3c1b360f95bbf6048e026c7c7851a892e4c39cf8c8f9ce83bf0139a2cfb2f3ed

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