Malicious PDF — malware analysis report

Static analysis result for SHA-256 d063c42b990afb3d…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 00:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a90947639f7567136a81167bceefade6 SHA-1: a401d55a61314e21e525e5ecdc711794d7ad6c29 SHA-256: d063c42b990afb3d800c8e861ab1137b0f6c8a4cbdd6dd295ee6cd0b78f1e124
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and potentially malicious content, disguised as game hacks or free generators. The presence of a download button lure further supports a malicious intent to trick users into downloading unwanted software or visiting harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-donload-for-free-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/shark-bite-hack-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-download-free-ios_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/generate-robux-for-free-without-downloading-games_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/guuuddinfo-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-jailbreak-2021-hack_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_off00005214.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5214 25536 bytes
SHA-256: 0c2f3c3c5b4ca2058c7f7fb71073ba1954b16050790b025c5fc098a41821a705
font_01_sfnt_off00008d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 18520 bytes
SHA-256: 1542032ec78b2bc570e433dcf4d13a22f6819a9bce1febb238441c337f0faffc

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