Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfbda1919f4eaa0…

MALICIOUS

PDF

73.0 KB Created: 2020-12-24 04:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c33301cb4b0837b19d9e9a21ea1901a SHA-1: 3720d98f29df3da49a983a051340ce85836f18f7 SHA-256: 4cfbda1919f4eaa022cd10fbac7e53b1a4fff5d1b2dd784e1525e314b4dcbb1c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://traffking.ru/wb?keyword=hidden%20object%20mystery%20of%20the%20secret%20guardians', is likely used to redirect users to malicious content. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm or SEO manipulation tactic, potentially to mask malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/wb?keyword=hidden%20object%20mystery%20of%20the%20secret%20guardians In PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/kodofekugilinir_pevubupenax_dupisimobe_nofozek.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/bcb15ee.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/zipowu_wutadigixawiga.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/woxewiwupir/american_horror_story_2018_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/zawejoto.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/texas_certificate_of_merit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/thank_you_letter_for_interview_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887c0dcf-fd73-4984-a2c2-da84064eb562/92518975611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cf4b4e-7894-409a-9c37-fa3d14ef7797/63378122071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9f0470-2934-4cb7-b409-e09d12bed8fe/93102521320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19aeb65f-4084-4d47-a39a-7ea1138778ff/wubevikelelixazokebali.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/dmv_owego_ny_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/27302545445.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/83613320168.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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 5684 bytes
SHA-256: e8a73ce82c351740fed9bf46fd57b567486f83d3613f31b3d558efa0b678cf78
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10580 bytes
SHA-256: a1c54b9f421e1db3be340d2fa34dfc9a38aad29aadb953c14dadc037dcc9e456

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