Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84a41a89e562f4e…

MALICIOUS

PDF

49.7 KB Created: 2021-06-09 03:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8681577d1ccb1f1cb4290fd09f01999f SHA-1: 6be89709fddadc497a8df7694dd9dd2fe70a590a SHA-256: c84a41a89e562f4e516a665645c9a48d6e4b58859c50e24ad9fab602cc43852a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" and "free generators". The document body, though partially corrupted, contains references to these lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-hack-robux-pc-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-hack-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-robux-by-completing-offers_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53ED 27608 bytes
SHA-256: b865901a95a3b06a9af8c5151165b9c2c516295889b74533cc6a774cd27c0e19
font_01_sfnt_off00009196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9196 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA7 18568 bytes
SHA-256: 07ae0239e9942c2a640db369170e250983af1522002d76e93f64ada255fb3dc8

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