Malicious PDF — malware analysis report

Static analysis result for SHA-256 14608f25e89ef2e2…

MALICIOUS

PDF

36.2 KB Created: 2020-11-07 19:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3e7436765f5b7c53a87ae206ddd2a728 SHA-1: b22d5fdf2595af927d50a331b384c83af817c297 SHA-256: 14608f25e89ef2e2e21adc7ab99ecd0280df8163fcdc1fe10e32b07d345f55d6
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, https://traffmen.ru/123?keyword=excelsior+middle+school+mo, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a coordinated effort to direct users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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 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.
  • 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://traffmen.ru/123?keyword=excelsior+middle+school+mo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f93f8db754be.pdfIn PDF document text
    • https://xilemuje.weebly.com/uploads/1/3/4/2/134265988/3ffd458ccc0.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/begaxu-pukevifiliwumu-koxakukume-sirenefede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8a2b9d26516.pdfIn PDF document text
    • https://dudazesulibo.weebly.com/uploads/1/3/4/6/134639231/xiponoz.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/sikuva/xojikibegopero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029ea9f7-b94d-4806-b5d8-8c3639185663/tajudorifetoguduv.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/funbox_tv_apk_download.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14b5f26-43c3-4307-a3e5-9bfcc59b0ed0/holt_california_physical_science_textbook_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/world_war_2_the_pacific_worksheet_answers.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/58401365237.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/second_kalmar_union.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_off00004ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFA 4996 bytes
SHA-256: e18b183e1afff05598a2fc65637fdd4cdf69ae511daca655b4b3f2eac2433997
font_01_sfnt_off000060cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 10356 bytes
SHA-256: cdab25ce577c9ec6a1de95882d365a900bc76f047d830dc80d7db8e7b9aae37b

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