Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e9fcbfc3576687…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 10:40:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d771c07759252cea489fed4df55a540 SHA-1: 926bf761b32008a3090ee69e6d914346855c28e0 SHA-256: f1e9fcbfc3576687e1ef28f08f7d6d75028257e17a0c7da14ebce8ff5edd5d57
220 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and SEO link farms, all masquerading as game hacks or free generators. The primary lure is a link to 'coin-master-daily-free-spins-link-game-hack', which redirects through netcdn.tw. The document body, though partially corrupted, contains similar URLs and text suggesting a scam or phishing attempt. The ML classifier strongly indicates maliciousness.

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/coin-master-daily-free-spins-link-game-hack In PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hacks-for-hilton-hotels_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/counter-blox-roblox-offensive-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-use-hacks-guis-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-a-old-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-sin-verificacion_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-100-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-money-in-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-robux-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-use-pastebin-hacks-to-swear-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hacker-el-misterio_GM431946152.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_off00003085.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3085 23048 bytes
SHA-256: 4532fe697ecfeb65d22e75ebc1a3523ac19fffc8c6a27be108b65c4eb740cfaf
font_01_sfnt_off00006457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 18768 bytes
SHA-256: 989ac8744b1238afa99b88b7bb3fb2df9d299a986309a52cf516f5921eb03fc0

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