Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8dc073755e21d2…

MALICIOUS

PDF

44.6 KB Created: 2021-06-13 16:36:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: aaeba3e06a47e54139a133ea9d5962b8 SHA-1: 3f839144d9ad8e2dd016942cef0263b1227088b7 SHA-256: ac8dc073755e21d28cd185180f049615784270e0708423dc6168848efdf878c2
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, disguised as "game hacks" for Roblox, and presents a fake CAPTCHA to trick users into clicking. The ML classifier strongly flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages, and the document's structure suggests it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.co/app/431946152/how-to-make-clothes-for-free-in-roblox-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-redeem-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-with-pastebin_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/new-hack-work-100-roblox-deathrun-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-roblox-2021-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/ccv3-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-items-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-2021_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_004_off00004e24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E24 25544 bytes
SHA-256: bf3825f3db39c7ab65301301dc135f4919a7c5f13a5d47c0a072095261c53e05
font_01_sfnt_off000089c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 18976 bytes
SHA-256: 93a8708c21f935752f7e41c63c7f83b9a649280aa1b887ec5fb219d2d79316f2

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