Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8a0bc68a20387a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 10:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e9853f03a9a88ef157246c609579fe85 SHA-1: d5202745763d1bd43e5283712ee0c16c829b7d47 SHA-256: ca8a0bc68a20387aa8a9f4bbac782a2f50e82142fb4eeeddf57281ec517f0767
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The document body and heuristics indicate a social engineering tactic to trick users into visiting these malicious sites. The presence of embedded URLs and the nature of the lures suggest an attempt to deliver a second-stage payload, likely via exploitation or a drive-by download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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 http://netcdn.tw/app/406889139/coin-master-facebook-hack-game-hack In PDF document text
    • http://elibrary.uinbanten.ac.id/repository/not-a-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/como-hackear-cuentas-de-roblox-xonnek_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-hacks-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-and-tickets-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003377.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3377 22964 bytes
SHA-256: ca239135d26400654248daba0fcad7b84cda56cb857d1083d0aff9e619f93417
font_01_sfnt_off0000667c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 18324 bytes
SHA-256: 6ad1846c5a228a809b9de1cefde13e0c6880a4115f839aceb456980284c5160f

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