Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baa004e77321bc3…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 04:45:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c4b07207c2fa00ad70bd3bd58e9bc411 SHA-1: 30fafe3f7ff09c557f011c3c816b5ef48913ab71 SHA-256: 1baa004e77321bc3ddf435fe0cb4602d46f0af229bec8e794569a09d1128beef
160 Risk Score

Malware Insights

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

The PDF document uses a lure related to game hacks and free currency to entice users to click on embedded links. One of these links, 'https://netcdn.tw/app/431946152/free-robux-jail-break-game-hack', is identified as a malicious redirector, indicating a likely attempt to deliver a secondary payload or lead the user to a phishing site. No scripts were extracted, but the presence of malicious links and the lure suggest a social engineering attack.

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.tw/app/431946152/free-robux-jail-break-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/can-you-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-pe_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-without-any-verification_GM431946152.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_004_off000053c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53C5 24812 bytes
SHA-256: 160c1fb6f163a96c365005b2306027f6fa1851de9fdfae7f923fca4a1e9b3e1d
font_01_sfnt_off00008c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1A 18772 bytes
SHA-256: 5add1a4e035190e3edddd61def2efcbc153d9687c8b88028a368730a8c912fc8

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