Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1feaa3f049b804a…

MALICIOUS

PDF

53.7 KB Created: 2021-06-07 10:36:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 34c6702d75b23b4ba8b03ebc03f6bda2 SHA-1: 0746524b254a778f6f4acf7098b0dfacf39107cb SHA-256: a1feaa3f049b804a03ec8df9a6e637b4cad16d4b245ada600ce567c0d401085e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA or human verification prompt, disguised as a game hack generator. The primary link, https://netcdn.tw/app/431946152/roblox-hack-jailbreak-download-game-hack, is associated with a game hack lure. The document's structure and embedded links strongly suggest an attempt to trick users into performing an action, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

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.tw/app/431946152/roblox-hack-jailbreak-download-game-hack In PDF document text
    • http://solidcommunication.ch/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/roblox-phantom-forces-uncopylocked-all-guns-free_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://solidcommunication.ch/images/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://solidcommunication.ch/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005386.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5386 28212 bytes
SHA-256: 9e8e6e5b0ff0ddd1d03aa7b636d391d98138a6f0190c17ace58369e6ff0ab180
font_01_sfnt_off00009322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9322 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000acd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD6 18972 bytes
SHA-256: 00c0686ebddf4fddfcc7a71440e05578af2ba1608d3ba6fe65828f4544094715

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