Malicious PDF — malware analysis report

Static analysis result for SHA-256 3948c75cf14f1423…

MALICIOUS

PDF

34.5 KB Created: 2021-06-20 04:10:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae4cbb7d2f81f3f6a6481ba07bc7011b SHA-1: 6134b9447dea0943fc48a7d09c4efb4c5ea7743f SHA-256: 3948c75cf14f1423964efde6159bbfaf2b3397aeedbe9b4394642938f249123b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and currency generators. The document body and extracted URLs strongly suggest a social engineering tactic to trick users into downloading a payload. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures indicate a high likelihood of malicious intent, possibly leading to the download of a second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/431946152/roblox-money-hack-exe-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-unlimited-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-muscle-shirt-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/download-roblox-for-free-and-let-me-play_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-website-offers_GM431946152.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
font_00_sfnt_off00002fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC2 22432 bytes
SHA-256: bf4c8b941bd87e2f4e15f2e44a031992ed73fdb9e1c101c4d79b319a82b8e113
font_01_sfnt_off000061ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 19032 bytes
SHA-256: 0bf01489fc3718ae2a3424ce0a73ea9a44fb09c1b84ac6d13b08d7c83a17d10b

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