Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc6b22d6e9f7469…

MALICIOUS

PDF

43.2 KB Created: 2021-05-17 00:34:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 62ee36f0226a41dfbafe4ad133ed2460 SHA-1: c0a51c92100e1c3ad726bd97ff7ce874af6691c3 SHA-256: 1dc6b22d6e9f74693907e78016b7b2f778913df3cc44405b6187633223f30b41
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, including one that leads to a 'robux-withdraw-game-hack' page. The presence of a fake CAPTCHA lure suggests an attempt to trick the user into interacting with the document, likely to initiate a download or exploit. The document's structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/robux-withdraw-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-pe-apk-free-download_GM479516143.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_003_off00004a17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A17 25016 bytes
SHA-256: d917eb5fefe2a4723b783caa3451c9442feaba501aeb782e45bed7333292364a
font_01_sfnt_off0000843a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843A 19004 bytes
SHA-256: afbca514ad09227755e431614afc8addacc3d3b35e400dc0197c8deef3f460d7

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