Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb27f4d799c8f2…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 16:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 63e237ee128e1c697b7c5eaf1c661c30 SHA-1: ad1d5ba0053457309ce5da30a5b0d4abc888ace7 SHA-256: 41fb27f4d799c8f27d5c922509d4a1da9bb53be13ebe60a7dd65cc0ab2c643e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The primary URL, https://netcdn.tw/app/431946152/how-to-get-free-robux-2021-fast-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to obtaining free Robux, reinforcing the lure. No scripts were extracted, but the presence of malicious links and the lure strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-2021-fast-game-hack In PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/who-to-hack-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/800-robux-for-free-gamekit_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/robux-only_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-roblox-noclip-exploit-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-hack-tool-free-download-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/pastebin-com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fd5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD5 25148 bytes
SHA-256: cbb4896b6751d399575e8851c6bd32506ead3b63bad06f6262e05346e9c23a8f
font_01_sfnt_off000089af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 18912 bytes
SHA-256: 0cf1407daece67cf4ec4590192117bb752715b8e9cd950978ca60bc845d52a76

Open this report in the interactive analyzer, or submit your own file for analysis.