Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c0c520753a158a…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 15:34:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3ee5f313c9cf078d374b405ce67d0194 SHA-1: 9f6b99469898798fd4a07d45be5379c5d65db5af SHA-256: 90c0c520753a158a15ccd3b6dce4ad7b9745fda64a0ea07f4851900672bb7975
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/download-coin-master-free-spins-link-2021-today-game-hack. The document body and heuristics indicate a lure for game hacks and generators, aiming to trick users into clicking these malicious links. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to distribute these lures.

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.
  • 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.
  • 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/download-coin-master-free-spins-link-2021-today-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/www-roblox-com-free-builders-club_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/youtube-fly-hack-roblox-2021-feb_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-10k-robux-for-free-2021-july_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/corn-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-admin-thumbnail-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-royale-high-diamond-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-jailbreak-hack-exploit-money_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-jailbreak-cheats-noclip_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-robux-in-iphone-5c_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/haktuts-coin-master-free-spin-link-today_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_off0000340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x340A 22828 bytes
SHA-256: 633697c3aa0562f164103c5abfdb13073f984c5e5d162abadcfecc1bf3a42289
font_01_sfnt_off0000675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 19504 bytes
SHA-256: 95988c68448a1ca754540d0d2f4ef0d2771c8f39fe215f992d1da7c8ae6d62cf

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