Malicious PDF — malware analysis report

Static analysis result for SHA-256 51096b404f2b9cb3…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 08:46:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9cb63a4c4b44c8e9df3e03ea66c967d2 SHA-1: 4e0b52736e3741db08454b0ef5623c3d3c41efbb SHA-256: 51096b404f2b9cb3cb7846288bcc1a2d5b1e832c1a01e1fc6ad3e10a17c4cf46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a known malicious infrastructure, specifically advertising free game currency or hacks. The primary lure is 'Click 100 Times For Free Robux', directing users to a URL associated with malicious redirectors. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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/click-100-times-for-free-robux-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux-hack-without-human-verification-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-red-pants_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-link-spin_GM406889139.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_off00004ea6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA6 26624 bytes
SHA-256: 4738371f8a0fd9712d6c4efb9e102796d198d2ab81904aaa6f4cfe1ba0bfc831
font_01_sfnt_off00008bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEA 18916 bytes
SHA-256: 77ca15ff851366f4238d33ad117825137345f7676164661941b66bae6b272a38

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