Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1122a03c8c66e3…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 07:56:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1e856ffb73a79223961d8e8e44b9966b SHA-1: c921261b994e4fbe0c53b25324fc104fe3079b66 SHA-256: 1a1122a03c8c66e3a954bf84cb00618624d2658ce9cd42c6e7b8273216ee9e28
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks' for popular games. The primary malicious URL identified is https://netcdn.online/app/431946152/free-stuff-on-roblox-game-hack. The document body and embedded links suggest a social engineering lure to drive traffic to potentially malicious websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/free-stuff-on-roblox-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F67 27392 bytes
SHA-256: a4bed8d7ce9a58f1f37ced7877bccaa7ada341fa3ccbf1ba7dbc2ffc7533a773
font_01_sfnt_off00008d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1C 18192 bytes
SHA-256: 903941a417559e7684521db1d707d12e6b393a834b1c6361693a3f5a10f7088f

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