Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8a22693f6cbc4b…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 00:11:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5926053bb51c7202c61cc3430b5e4ecf SHA-1: 547abe31cd2bc9f05644091299909e42633bc44a SHA-256: 3e8a22693f6cbc4b4ffb5ca03e0d321d3b5135e1540b31d4cba93d97a4d11729
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what are identified as malicious redirectors, specifically advertising 'game hacks' and 'generators' for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of these lures suggests a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

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-clothing-hack-2021-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-powerful-gun-on-nuclear-plant-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-esper-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-piano-monody-hack-delay_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-bc-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-roblox-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-pics_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-accounts-with-robux-that-work-2021_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
stream_002_off00002f60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F60 22104 bytes
SHA-256: 124ee6a5f25ef3004699d72c65feb91308a2be75b5bdf63c5abaf9a8f8688769
font_01_sfnt_off00006084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 19448 bytes
SHA-256: bbc0292e89a25e16e2b94b3a6ce4536da7a6a88225d2dcc00911e8db6a831cab

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