Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2505ac6c1d0fcd4…

MALICIOUS

PDF

49.1 KB Created: 2021-06-03 05:05:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 20c24aa6283215f1b6773a360030992d SHA-1: d8c65e37e9e8388414657c1417517a1e9756010f SHA-256: d2505ac6c1d0fcd4842f565d8c35d3946a40b0ee7748ab9b9e15a3ba13989fe0
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure for 'free generator / game hack' content. It also displays a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious links. The embedded URL leads to a known malicious redirector, likely serving as a gateway to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/counter-blox-roblox-offensive-how-to-get-free-skins-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/pubg-uc-hack-apk_GM1330123889.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/pokemon-go-free-7km-eggs-july-2021_GM1094591345.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F1 27512 bytes
SHA-256: d3ba00514c5a2668bd855400f5964a081201a74697a5a03dde8fff2ad04c3407
font_01_sfnt_off00008f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F55 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFD 18760 bytes
SHA-256: a9c9ce2b23ea663efd3a6a08f52050094aef6af762f7dfe4af0f71e3912d72d1

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