Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf75c78b9210ee4f…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 11:44:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 75dcfc471bd507b8f2c3ce6bcd9374be SHA-1: 0860d764808a3dd1dd695a7fb1bd26729d3bfb73 SHA-256: bf75c78b9210ee4f690503e6ebaefc38d36bd4c767aa8c7f284ec6b0f1a60bb3
228 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on potentially malicious content, disguised as game hacks or generators. The primary redirector URL, https://netcdn.tw/app/431946152/roblox-money-hack-no-human-verification-game-hack, is a key indicator of this malicious activity. The document body, though partially corrupted, contains references to 'Roblox Money Hack' and the authoring application, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/roblox-money-hack-no-human-verification-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-tampermonkey-script_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-how-to-get-free-hats_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-from-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-generator-no-human-verification-no-survey-or-offers_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-no-buying-games_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-fan-page-giveaway_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
stream_004_off00005455.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5455 27680 bytes
SHA-256: 982cdbe9f37e9bf4646df6ba72ab70349b2e32cd93b90e7d5b18c8729c109db8
font_01_sfnt_off000093a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A5 19316 bytes
SHA-256: 22c94a9da5878b9c608ccbd14acd843e53a361b1bbb9d70bce26b59bbe53ec6c

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