Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c32f8db87c8c4f…

MALICIOUS

PDF

33.7 KB Created: 2021-07-07 20:20:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c69ac367a2d6248382d9748dab6aa34e SHA-1: 0cdcf0d5b2518100ae8dbcf8f33a08d3deb0aa06 SHA-256: 99c32f8db87c8c4fde610c200d9d164c9c85d3ce9bdd221ab39fd6baae4b459c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency, aligning with common phishing and scam tactics. The ML classifier also flagged this document as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest a phishing or scam campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-link-app-game-hack In PDF document text
    • http://katalog.stikesmukla.ac.id/repository/april-fools-roblox-hack_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hack-my-boyfriends-roblox-account-back_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-free-robux-apps-download_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-skywars-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-robux-with-a-fake-card_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-jailbreak-robux-hack_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/easy-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/my-account-was-hacked-on-roblox-what-do-i-do_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hacks-for-boku-no-legacy-alpha-2xexp-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-pepoles-roblox-account_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/minecraft-java-hacks_GM479516143.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_002_off00002d9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D9B 23036 bytes
SHA-256: 6f0717f24c42ca0c744cd30eeee38e04d3994de8c813644395ee0413f459cb51
font_01_sfnt_off00006155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 18180 bytes
SHA-256: 2ae8f2b3b5cdc8131dc5e18a1aa1f950e285eeef7e1996aa3994a171319f8738

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