Malicious PDF — malware analysis report

Static analysis result for SHA-256 4100917fd806a09c…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 13:54:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9706d0cd9740862c46fe5c8b5fa9a48f SHA-1: f3cf8f97977b1f146488c4e8908f1b932ff7a33d SHA-256: 4100917fd806a09c47fc92fcf463e0e82e2db290cf22cc047b60719a207000f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to a 'coin master hack' lure. The document body also contains the same URL, reinforcing the social engineering attempt to trick users into visiting a site that likely hosts malware or further redirects. No scripts were extracted, but the presence of malicious links and the lure suggest a phishing or malware distribution 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-hack-activegamer-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/discord-free-robux-bot_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/when-do-hackers-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-generator-without-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-clothes-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-r7-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-and-fortnite-bee-swarm-sim-free-eggs_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/cheat-bar-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/best-free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-white-hair_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/mad-city-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-someone-on-roblox-like-anonymous_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-not-fake_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_off000033de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33DE 23196 bytes
SHA-256: d5c436de209a047ece43a4ae1bab202926b10e7e9cf5bf671b8cebff64307598
font_01_sfnt_off00006824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6824 18376 bytes
SHA-256: 9071112516a3c1a751db78ff2cf185d6a5c8a1d73babf85370e027775254c109

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