Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab51e9b99c4c828c…

MALICIOUS

PDF

42.7 KB Created: 2021-05-17 19:19:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5857bc653212716217271bbb27c31c6c SHA-1: a716e815befff0166172d3a77a4a3c83d58c9652 SHA-256: ab51e9b99c4c828c297a2c201d56b188a25d97e55a2afe2099cf894d0737f9cc
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 'game hack' or 'free generator' content. The embedded URLs, such as https://netcdn.xyz/app/431946152/earnrobux-game-hack, are likely used to download and execute a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/earnrobux-game-hack In PDF document text
    • http://ristorantimaculan.it/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://ristorantimaculan.it/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://ristorantimaculan.it/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://ristorantimaculan.it/images/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B97 24940 bytes
SHA-256: c00abc3766c82567d3f2860c16d118e07245161f23f660ea74454508a6010dba
font_01_sfnt_off000084f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F5 18076 bytes
SHA-256: 2721194a66b32dfdaea4e26ed0bd84b304de41eeda81871a4ffc347c5a8adb25

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