Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b17909769330ae…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 18:09:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d39fb5c895c5dadd9a2dc2bc28c85935 SHA-1: 90da7107fa1b1aadd43dbbf5065baed55c0d6012 SHA-256: 81b17909769330ae43ff2074a35451ce4de9bf8f15f8fc5850d3592f821fc9a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs that lead to a malicious redirector, likely designed to lure users into downloading malware or engaging in further phishing. The heuristic firings confirm the presence of malicious redirector links and a game hack lure, indicating a social engineering tactic to exploit user interest in free game items. No scripts were extracted from this sample, but the embedded URLs and document content strongly suggest a malicious intent to redirect users to potentially harmful sites.

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/479516143/free-minecraft-codes-game-hack In PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-elemental-battlegrounds-free-diamonds_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/pokemon-go-free-60fps_GM1094591345.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-no-inspect-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/cheat-download-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-coin-master-free-spin-link-facebook_GM406889139.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
font_00_sfnt_off00003028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3028 22624 bytes
SHA-256: d05e47dec1462f5a8165e8b2dff4542f45080d67de9262ecec9852cf093f4a6c
font_01_sfnt_off000061e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 18172 bytes
SHA-256: 65034997240625fc9e44cd9f21ee7637befba1e18adc5d1f22f8eab3c90cf7a5

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