Malicious PDF — malware analysis report

Static analysis result for SHA-256 81153dcf0eda4048…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 19:26:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b9ede3d61fc9da3a2ba14773e1b46753 SHA-1: 1d56819356d91c8e2e198aacb33e70aec4d19b75 SHA-256: 81153dcf0eda40489ba2c1a4151a20d66c2aa45191895b5286f6a81622a41013
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or downloads. The document's content and embedded URLs strongly suggest a phishing or scamming attempt.

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/406889139/coin-master-100-spin-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/2021-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-driveblox-unlimited-money-cheat-engine_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-bubble-gum-simulator-free-pets_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacking-into-denis-daily-account-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/code-kingdoms-free-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/isuku-roblox-free-shop-hose_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-downloads_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-vip-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-cheat-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-guaranteed_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roaming-camera-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002efd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EFD 22876 bytes
SHA-256: 79dbc8cdc87e463836c5185df1536bae24a80b0b09650298b86a94811b1d84e8
font_01_sfnt_off0000627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 18288 bytes
SHA-256: e7eedd1d7f2d1bddccca1a35bcbf42f4aa03d5dcfedc55eaf08a1a6e6f1d261c

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