Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b55e43bc4862eb…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 14:20:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8b64b47e25799468cdf2cb38715b2255 SHA-1: 3983359d04d7dce9e7cf603392a18a2c4b74e374 SHA-256: 77b55e43bc4862eb55c30ab49bb8caa2ea199f80f8a284c01c5866b67f8bf48b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "free generators" and "game hacks". The primary link, https://netcdn.online/app/406889139/free-mod-apk-coin-master-game-hack, is flagged as malicious. The document body and embedded URLs suggest a social engineering lure to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.online/app/406889139/free-mod-apk-coin-master-game-hack In PDF document text
    • http://perpus.wdh.ac.id//repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/pokemon-go-free-dragonite_GM1094591345.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/114-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-apk-mods-coin-master_GM406889139.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_004_off000051a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A1 25628 bytes
SHA-256: 3555c72b2d4abb49257f26f3eb05f9eb306b47f38621f78290e5752f5b87530f
font_01_sfnt_off00008cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF8 18228 bytes
SHA-256: 94a160b3eebda81a774dce60345efae5de7f6df629fda5b11a26048b94d99866

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