Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ab1f2394ced103…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 16:25:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ed1c76e6f73758e41d756297553237ad SHA-1: 4fc0b54631eff5c180a8ad45d1e367f6a362cd35 SHA-256: 77ab1f2394ced1037d7e353fce85239a6bd6644a089b487d3c5ffc6136b76353
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious URLs, disguised as game hacks and free item generators. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it links to known malicious redirector infrastructure. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to trick the user into visiting a site that may host further malicious content or attempt exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/is-minecraft-free-on-xbox-game-hack In PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-apocalypse-rising-hack-gui_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/can-you-get-in-trouble-hacking-an-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/the-most-opiest-script-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/admin-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-hack-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/hack-to-get-free-spins-on-coin-master_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
font_00_sfnt_off00003504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3504 22720 bytes
SHA-256: 990c13ec9c37cdb6ff6886b3338a763ac9a3ab3d7b968b03c734e7999d280f41
font_01_sfnt_off000067e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 18596 bytes
SHA-256: 987f99d7e2443cf381540eae1143ad62299bf58b05908f5564068197b2bc8841

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