Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77b0054e7cb2212…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 14:45:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f9697beca5f16da11fb5883a09316d13 SHA-1: 0e798fad94004aecc19400d29affe42cc3282923 SHA-256: f77b0054e7cb221291b14c40ec70f164dcc20057a48cb7016da9b9aadc53f63f
160 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, disguised as lures for game hacks and gift card generators. The primary link, https://netcdn.tw/app/431946152/free-pin-numbers-for-gift-cards-for-roblox-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to similar lures, reinforcing the malicious intent. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-pin-numbers-for-gift-cards-for-roblox-game-hack In PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hack-roblox-autokill_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/pubg-uc-600-sri-lanka-price_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coinmaster-twitter_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_004_off0000520d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520D 26060 bytes
SHA-256: 6d352f0e430124da0baaf3eb3c9807496e0eec1ac218e761ef984565fbda8dd1
font_01_sfnt_off00008d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1F 19128 bytes
SHA-256: 9df109a9ae387e24bea5c8183303ba3d3c46d1670724c3c097d93808b9cbf09c

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