Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f5acf1303a0d0a…

MALICIOUS

PDF

41.5 KB Created: 2021-05-11 04:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 11f6e1dfa45fa45371d685759c887d1b SHA-1: 29befa11f96af7aab63bdb0f40d50e44b8cfa986 SHA-256: d8f5acf1303a0d0ada68100b8a606d07d96832672c4affba89e7869de0d278d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically targeting users with lures related to game hacks and free currency. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-codes-game-hack In PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-no-verification-or-survey-2021_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_003_off000049e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E3 24096 bytes
SHA-256: cf3527ae8d991b291c755a18125c0731a78d6ea211e9c7da0c85c513037c9508
font_01_sfnt_off000080d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D7 17884 bytes
SHA-256: dce98ab1a9f6331dfaabbdd57dacdba92c66b57249d10e9c2a1df39138c2a47b

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