Malicious PDF — malware analysis report

Static analysis result for SHA-256 323e8edd21d5f6e1…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 07:51:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aaf123671c316a272ebf86e181a6ac8e SHA-1: 62ff40244c4496f48b72fb35d56ce8f84d9da338 SHA-256: 323e8edd21d5f6e16043a7539b2abf7055dc9cc7318b17d3b41cefda9f5fdcb5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the promise of game hacks and free currency to trick users into clicking malicious links. The document contains numerous links to redirector infrastructure and SEO-linked PDF files, indicating a campaign to drive traffic to potentially harmful sites. The primary malicious link identified is http://netcdn.tw/app/406889139/free-daily-spins-coin-master-game-hack.

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/free-daily-spins-coin-master-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-hacks-tay-take-off_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-how-to-get-in-bloxburg-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/slurp-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/murder-island-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-make-t-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/well-hack-net-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-computer-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/download-speed-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/pokemon-go-free-balls-code_GM1094591345.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-no-survey-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-verification-no-details_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-free-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/infinite-money-hack-roblox-jailbreak_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_off00003319.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3319 23212 bytes
SHA-256: 652da780d47378617b4fa2bd852e85129da2cae614d399b0a3d983fd64b2dd18
font_01_sfnt_off0000675e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 18596 bytes
SHA-256: 4ad8fd882529be3d23a027a1092be38fd3a881cb86878c09c64331b24aa9a906

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