Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc1c40726bfafd…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 06:35:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2e56d5a0358d2bba9f2bf86cc596fc8 SHA-1: e49e9a0b853d6a67e41ac18b7bc6d29e8ad469d7 SHA-256: dcbc1c40726bfafd3e2ee8001e4ad770b8e6eabed1675b72d8b35ecd7553fa7d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with a critical heuristic identifying them as malicious redirectors and part of a link farm. The document body, though heavily obfuscated, contains a URL consistent with these findings. The primary lure appears to be related to 'Coin Master' game hacks, a common theme in phishing and scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/406889139/coin-master-free-spins-link-today-hack-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/add-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/tiktok-free-quality_GM835599320.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_off000050e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E9 24600 bytes
SHA-256: 264d92fe7f2f7bcfae159c2ac9093290e4a426701682b0bcf008687e30ae9331
font_01_sfnt_off0000895c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895C 18412 bytes
SHA-256: 78e241cf2016df2e6ebc2ce00be22676d65e6ec45cce47e077571dd8c0cc4425

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