Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6605a2b846654a…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 09:47:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0a5917109c38a88862755555c8d896b0 SHA-1: a13f84b7105e1548f70bbff8258253dda426b7e9 SHA-256: 2d6605a2b846654a12079fbc623a467d16745354ee57fc6e4ef1555584c6411e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' to lure users. The document body, though heavily obfuscated, contains text related to hacking Roblox accounts and references a URL that is also flagged as a malicious redirector. The presence of embedded URLs and the lure suggest an attempt to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-hack-any-roblox-account-with-their-roblosecurity-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/tiktok-free-online-unblocked_GM835599320.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-match_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-assassin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-bee-swarm-simulator-cheat-codes_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-android_GM431946152.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/free-robux-live_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-build-hacks_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_004_off0000541a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x541A 25436 bytes
SHA-256: d725bf3aeba1cd058fe669740cb5802bb7569ab9193afc5bbcacae4f693afa48
font_01_sfnt_off00008f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 19252 bytes
SHA-256: 217fc600a03e5bb96b4139f6c3dce513f2a800ddc2f8ceccd61a785025ab2976

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