Malicious PDF — malware analysis report

Static analysis result for SHA-256 778aa8841e2dafe3…

MALICIOUS

PDF

66.6 KB Created: 2021-01-22 01:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4c63c57f624e27d83077097adb066c8 SHA-1: 4806f1776788031f7fe6d235ee45da3ced17c427 SHA-256: 778aa8841e2dafe333a417b8458ca2b68837f685d3979ec741c1f5ad0206ceb6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link to known malicious infrastructure. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicates an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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=purple+bunny+games In PDF document text
    • https://site-1184900.mozfiles.com/files/1184900/video_player_banner_for_twitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f592e7b33.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hdgcWjh/91315241466.pdfIn PDF document text
    • https://site-1176876.mozfiles.com/files/1176876/2020_live_wallpaper_download.pdfIn PDF document text
    • https://site-1171905.mozfiles.com/files/1171905/32486836295.pdfIn PDF document text
    • https://site-1171745.mozfiles.com/files/1171745/junede.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/6sgdBvI/lupevomoluxatovaveborew.pdfIn PDF document text
    • https://site-1177817.mozfiles.com/files/1177817/93355559082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwojewemuxa.epizy.com/casio_mj_120d_calculator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/bendy_and_the_ink_machine_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/79029872909.pdfIn PDF document text
    • http://merojupamen.epizy.com/esl_1st_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/vubavanufifazov.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/57396300060.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/treatment_guidelines_for_congestive_heart_failure.pdfIn PDF document text
    • http://lagefow.epizy.com/valkyrie_connect_mod_apk_5._3._0.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/50366938113.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 5380 bytes
SHA-256: 2f2a98860f0af3897bd372c76a1de8488c799cdf7ff0f55045caea79c2375213
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 9520 bytes
SHA-256: b4ea508aa41967488e47a6b462079467aee9a36c4944882db3da7dce10a0b915
font_02_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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