Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5b781f1dbb121e…

MALICIOUS

PDF

40.9 KB Created: 2021-07-06 11:40:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0ceb3d5b7d5fa39748a3c6fa39e74f8a SHA-1: 2d34f620d9e7fee0b488e1b1f065b10696e9f915 SHA-256: 8a5b781f1dbb121e9d08ff2feefe4af78b98f001617455c7d2c88e889534cd6c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on "free generator" or "game hack" content. The primary link redirects to a known malicious infrastructure, and the document body is heavily populated with SEO-optimized links pointing to other PDF files hosted on a link farm. The overall pattern suggests a phishing or scam campaign aiming to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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-free-spins-that-really-game-hack In PDF document text
    • http://projectunionstreet.com/library/repository/how-to-hack-another-player-on-roblox_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-cool-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/hack-the-robux-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/best-free-roblox-flight-simulator_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C7 23424 bytes
SHA-256: 51ffb131d5001ba7b8fe587c5f14c2a66bd3d3b5f282ecded9eac254a68f58c7
font_01_sfnt_off00006690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 7004 bytes
SHA-256: f1dfb1f279386a08e3b7150713cd5cf1fdcb8bfa6c4644856ad12889b36f5107
font_02_sfnt_off00007c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7B 18592 bytes
SHA-256: 6ce224978adda1273fbe859cfaaf113315cbbc733c62935cb77f5f7075e1d2c6

Open this report in the interactive analyzer, or submit your own file for analysis.