Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bf4d11bdb44b7e…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 23:42:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6b100137bf8b9d68fc9aa4cde793c892 SHA-1: 58bd77dc14d9a0e9082a78202db0a0ead17314f3 SHA-256: 88bf4d11bdb44b7efce0296b4f8c59c6e861139d8a976b077dd8a206f11e16ca
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body and heuristics confirm the lure is related to obtaining free in-game currency or hacks. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-hack-coin-master-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-comcom_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coinmaster-spins_GM406889139.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_off00005046.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5046 25132 bytes
SHA-256: 8a7388126dca7d47ee8d34b19cf0059a941dfe0ae36e9eafb38091490930bdc6
font_01_sfnt_off000089a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A3 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000938e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x938E 17880 bytes
SHA-256: 811ddb8557bc0f5be85009fa6d5ae0baa2b7fc09c58d91c5790597872cecd122

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