Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c9743e35bf678a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-11 03:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 94b1c8e6dd3580b770bd693e0686aa6e SHA-1: fc1bd0fc6f29e2415fdb8a0d701ae4774883a26d SHA-256: 98c9743e35bf678a6d87d52274965f1ef2e2412d8a087fc46a4fec0c08f53574
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hack generators. The document body and embedded links suggest a lure to trick users into clicking through to potentially malicious websites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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-hacks-free-spins-game-hack In PDF document text
    • http://stroygrad-spb.com/images/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/my-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/dailyrobux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/robloxheroxyz-free-robux_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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 24128 bytes
SHA-256: 1d0e5e191da942acec3c31edfd3b878c56951d0e4e2538983cd3d9bc57b602c5
font_01_sfnt_off00008182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8182 18056 bytes
SHA-256: 12d79a7ddbb75c7a0854102822057d5441bee2ca4a20c79f8211a3d0b9a1f375

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