Malicious PDF — malware analysis report

Static analysis result for SHA-256 308391b048c9d379…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 07:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: acbb42238ec310af475174a8022ec3ce SHA-1: 5e0c8db9e196144d97095db1341ca59ed37c7221 SHA-256: 308391b048c9d379fd5ddf779ea2ff4a8f64e9ae80ce8b938db2aad056bddf90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them, ostensibly for free Robux or game hacks. The primary link, https://netcdn.xyz/app/431946152/can-you-give-me-free-robux-game-hack, is identified as a malicious redirector. The document body and embedded URLs indicate a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/can-you-give-me-free-robux-game-hack In PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-robux-easy-hack_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_off00004bbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBD 24572 bytes
SHA-256: 7c6a11840c7b926ab2596dae5bf296418044366487fa79ad17253555cc869cdf
font_01_sfnt_off00008418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 18836 bytes
SHA-256: f7ef8038c45e68508aae9bb0b63a3af28c92eee5ac21090050d85675c825651a

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