Malicious PDF — malware analysis report

Static analysis result for SHA-256 d850874c5d30b687…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 23:41:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 970100d9ab30fd887e0d472df4b9dfb1 SHA-1: dfc98efb6e1be70e5ce66bbf92dc4f7f38e91cc2 SHA-256: d850874c5d30b687ce4a88307d8a0b28da67de5c5925598b6c3521015b5a6436
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and document body text that promote free game currency and hacks, specifically directing users to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary lure is the promise of 'free roebucks' and 'game hacks', which is a common social engineering tactic to drive traffic to malicious sites.

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/431946152/how-do-you-get-roebucks-for-free-game-hack In PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-roblox-with-notepad_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/easy-games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/earn-free-robux-online-android_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/robux-hack-tool-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hack-zombie-attack-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/i-hacked-nubnebs-account-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-assassin-hack-coins_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-do-you-make-a-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/dungeon-quest-roblox-farming-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-aout-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-promo-codes-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/now-roblox-logo-gives-free-robux-robuxmaniac_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fc5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC5 22540 bytes
SHA-256: 6b675fac30aeaaf79ca1c36a12c28ad42b3a52157e6a5781f845d595559743ae
font_01_sfnt_off000061fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 19276 bytes
SHA-256: 041621602f91f6b02ab17a8512f032c3ef5c76435d73db42d8fa43aa781a2561

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