Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aece3b84f6fffa8…

MALICIOUS

PDF

46.2 KB Created: 2021-05-19 15:13:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 82b5b38b7ceeab931345d018b167fdb9 SHA-1: 69d715f92e589636cddd43bbb25350d90f73a7dc SHA-256: 3aece3b84f6fffa8c81c168a0a607bf4a6b2234ff206ba5098399395c4e8fc6a
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks or generators. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick the user into clicking the malicious link. The document body, though heavily obfuscated, contains URLs that align with the malicious redirector findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/roblox-source-game-hack In PDF document text
    • https://tpp.com.tw/image/data/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/link-coin-master_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-no-scam_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_003_off0000482f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482F 25092 bytes
SHA-256: 377c0481958c4ccabf621fec081f2e72cca752dadb60a6a241a4babc4847c1fa
font_01_sfnt_off000081a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off00009316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9316 17924 bytes
SHA-256: de701b1390df5ea6859c32be6292d3183886ea3a2a613b5f80b12093d50b4b47

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