Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9311d3715abb4d7…

MALICIOUS

PDF

46.4 KB Created: 2021-06-04 03:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44f51ba73b9c5ad9fdc96cfcb1aa72a7 SHA-1: 91ab1509f1565f75895b074e920f78d16e5e5139 SHA-256: e9311d3715abb4d76d2cb741d60d3560358346289cadc43b9a50ba8048e7f73b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising a "Coin Master hack" and "free spins". The primary malicious URL identified is https://netcdn.online/app/406889139/legit-coin-master-hack-no-human-verification-game-hack. The presence of embedded links and the lure of a game hack strongly suggest a phishing or social engineering attack, likely intended to lead users to a site that hosts malware or attempts further credential harvesting.

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/legit-coin-master-hack-no-human-verification-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-alt-accounts-free_GM479516143.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_off00004f14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F14 25240 bytes
SHA-256: 583a0170721912c4199a27685c6b24a5c129e13caddd0e45fece6d4f1e498dcb
font_01_sfnt_off00008805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8805 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000091b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B7 18540 bytes
SHA-256: 944ef90ac3957acf4ab0155e17f54942f1cad929ef859b36db5d7006f4b781e4

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