Malicious PDF — malware analysis report

Static analysis result for SHA-256 d256c48f0c03335d…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 11:40:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74b4467dc65c36181248859d1120607c SHA-1: 657693eff440dd617aeb647ffc062e1759b7744a SHA-256: d256c48f0c03335d1a21b37eda13a5324588aed2d50f3f3c8ae1c92c6eb335ce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely intended to deliver a second-stage payload or lead to further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/coin-master-free-spins-hack-without-human-verification-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD6 24612 bytes
SHA-256: 93fd3afb3aa0d49c919201f8bde397b8ae9ba7411975c2f4477dac90add11997
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000915e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915E 18952 bytes
SHA-256: bbe995309b6761320a89de429a491d1b27525b5c8b766f3497e3cab7bbe78ffa

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