Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b1530a236b9d2f…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 01:48:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ea7259288c8a50279179ed61db2abc96 SHA-1: a9d0ba6b81828970c18bff905586a885d1642a1b SHA-256: f8b1530a236b9d2f9148aa6b254c121dac2a9de66bc1c1c06b8c17a066d7cf7d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links designed to lure users into clicking on what appear to be free game hacks or generators. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document body and heuristics confirm the intent to drive traffic to these deceptive URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/objet-roblox-library-free-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-control-panel_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hot-to-get-real-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/buy-robux-for-free-2021-april_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-games-by-admin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/claim-free-robux-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/old-roblox-logo-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/100-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_002_off00002f45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F45 22668 bytes
SHA-256: 7745d623814ef8512a5dec144716bdfb6e6a25a8d78422a30a15f87fb6202dd5
font_01_sfnt_off000061fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FE 19244 bytes
SHA-256: 4727f99e07bf10c290b732ccbe53a0e311294e2c37424e2d581c0c6096335403

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