Malicious PDF — malware analysis report

Static analysis result for SHA-256 250d50435560a14a…

MALICIOUS

PDF

35.8 KB Created: 2020-11-03 06:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 84f8031a1fd2cf961d6fe637b1e2d675 SHA-1: 9b7ac96533fd816ef9fe89a88f023831d5a69e87 SHA-256: 250d50435560a14a2291a505d6a8e40af74fe34cf194b044d6b35e7ed511b9bf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF contains multiple embedded links, with one critical heuristic identifying it as a redirector link to known malicious infrastructure. Another heuristic indicates a link farm pattern, suggesting an attempt to manipulate search engine results or distribute content. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector. The presence of numerous links and the ML classifier's high confidence score support the assessment of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?keyword=myasucourses+asu+edu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_5f9704c98d404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f8c654934679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f91f8659b14c.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/fe7b25e1-4ffa-40b9-b5de-28c4b4d078cf/nikito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c1695d-86c6-4e2b-ae2c-72cb68b24fbf/25131541720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/westell_versalink_327w_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29be8b6e-cc10-432c-b830-88a375e4f2ac/47827652463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6949/5227/files/how_to_get_god_mode_mw3_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e1d00e-2226-45d6-8b1e-18333e747f32/sexlab_more_animations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af29a505-0aca-4471-bbc1-f0abc1e4dbfd/vufozotezodonariduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca34c34b-547d-4891-bfa9-cc052852c4c1/lyrics_to_lead_me_guide_me_by_traditional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac0a3ef-fb69-441d-87b5-e63000850bde/walozadafuzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b11606c-c8af-4817-8956-adea1075d1d5/31922269867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f07a3-d2f1-4095-aa77-de95a764a5e9/intermatic_malibu_ml600tw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6874c77-912b-43af-9d1b-c8aaa7e920be/1566456591.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_off00004e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E44 5008 bytes
SHA-256: f15d28f439355b3138bacdbf881f1f3ad64e81dfdf39e501edb564322489257f
font_01_sfnt_off00005f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 10272 bytes
SHA-256: c1a53a9e1154f416073259a8cc407707cb6b37da026d95b98349f61f3dee40ba

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