Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c970231a9a4fcc…

MALICIOUS

PDF

79.9 KB Created: 2020-11-17 17:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b176313f3eff3212f92e8519925e11c SHA-1: bcb64000af17a2fe2d6e1bc9f2b5096679f9685a SHA-256: c5c970231a9a4fcc0c45fca436462dfe87375117fe2e03e9932cf6a1552e28ad
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'gettraff.ru'. This, combined with a high ML score and ClamAV detection, strongly suggests malicious intent. The document body, though heavily obfuscated, contains text related to 'neo.emu apk free download', indicating a potential lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gettraff.ru/123?utm_term=neo.emu+apk+free+download In PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/xolifojovinedub_wifav.pdfIn PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/5819298.pdfIn PDF document text
    • https://zafugetab.weebly.com/uploads/1/3/4/5/134502131/859fd39e52f.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/23c56a4c-f47f-4a28-8e64-445dc2a0ef7e/19167360562.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/3566684143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3544b89-d238-4a14-836b-76714bb8d19d/the_complete_book_of_numerology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd00c24-ab7c-4922-b30f-fd257061fea7/4773616891.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/electricity_crossword_puzzle_answers_physical_science.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/landline_text_messaging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da5393d-0dda-4f6e-bb1b-6dfbcf85425c/19266472242.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/firigovawidede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93844c0e-cba0-49b2-8ac9-6917e573a14b/basekosofameje.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/cardiopulmonary_resuscitation_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1617f736-a86f-4780-aa5e-980c8ed67586/que_paso_ayer_2_pelicula.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5168 bytes
SHA-256: e53761860551125f85cc01a42a6323ad50718a88d70f2677e6059239a9d6fad2
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 2120 bytes
SHA-256: 71de4445887a567661c207e4d57037bd6236ed7f7817f9f13275983befead28a
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 11112 bytes
SHA-256: 6dd3fbd7f9c7386d8569f60a404033772c18834bd2f8101461fe0b0d6b1ede22
font_03_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16176 bytes
SHA-256: 10eb2f14374f37aee8e90f5ce6d1d22c2978b813fcdeb38c2a5b4e45b5f07117

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