Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8eeb1715360c02…

MALICIOUS

PDF

44.2 KB Created: 2021-05-14 06:37:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 527453bf5661aa6d0ae049aa1067ca78 SHA-1: dbe14a13beadf95c5bca663423af36c7ea6ab78f SHA-256: 8f8eeb1715360c02e931cf5f09952a77bc653b45f0e2014b4f744cdbaebe9a6c
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded links and document body text that promote 'free Robux' or 'game hacks', directly linking to malicious redirector infrastructure. The primary lure is to trick users into visiting these sites, likely leading to further malware downloads or phishing attempts. The ML classifier also strongly indicated maliciousness.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-promo-codes-game-hack In PDF document text
    • http://ghhs.com.my/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/no-human-verification_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/real-free-robux-codes_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_003_off00004a8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8A 26648 bytes
SHA-256: 33ec68a21717fc1c78a6290b4a628e7c10821de4dc3db3c71ac07a1461e5493c
font_01_sfnt_off000088e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E9 18872 bytes
SHA-256: 5ac59f2bbd716fa5a12c7062aef47b6358464a1e75e3d61e5fb3ce0da7ae841b

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