Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e041b290b15162…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 22:28:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b92899c767bf2dce9a5c88c647e9da63 SHA-1: fa81e0e3819767706c137d0eeb2ef073d4116a63 SHA-256: f5e041b290b151626fc517338f45f3656d5fd30bb794a4016c75b989235cd747
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game hacks and free currency, with a primary link identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests a phishing or social engineering attempt to direct users to potentially harmful content. No scripts were extracted from this sample, but the overall structure and heuristic firings indicate a lure for potentially unwanted or malicious content.

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.tw/app/406889139/free-coin-master-spins-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-bloxbux-on-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/infinite-jump-roblox-jump-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-you-get-free-robux-ad_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-cheat-money-on-roblox-retail-tycoon-glich_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-para-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-stella-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-flood-escape-hack-script_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-a-roblox-account-august-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-generator-hack-100-real_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-spin_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_002_off000031ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31AC 22760 bytes
SHA-256: 561747abcc072f4e2d89f01062801a2178e08f58b653c6ae01de099eca42d2d6
font_01_sfnt_off00006488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6488 18176 bytes
SHA-256: d879af8bc9fc9deb269bc048f5c37c8554bb873823b666d5fc770bf8781c9e47

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