Malicious PDF — malware analysis report

Static analysis result for SHA-256 391b0626e4188db3…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 22:06:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 40b42d9aa61ea2b4a03d4428cf7f1d1a SHA-1: b5848020d47510a903a092276e6203c1f01489c0 SHA-256: 391b0626e4188db34cdf2bdbc7fb9ff6c475964d65feb05a4c2adf68a40863e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free item generators. The document body explicitly mentions 'free spin link coin master today' and includes URLs pointing to 'game-hack' and 'robux' related content, indicating a lure for users seeking cheats or in-game currency. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely leading to further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-spin-link-coin-master-today-game-hack In PDF document text
    • http://projectunionstreet.com/library/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/2021-how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/aimbot-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/price-of-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AD 23244 bytes
SHA-256: 88873a1f3fb9a19f2b77d8ef4d21118594c0ca4e4a3e59ebd482679ebed76e82
font_01_sfnt_off00006507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6507 18696 bytes
SHA-256: 31881190b33b808cb817da8829c891faee4b93e4bfb09ae76d7fe90b75b9481b

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