Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b393ce860b6f643…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 09:23:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 95f1fd4657121fb1e3ebf599b69aef95 SHA-1: 60793939717558050c4ab194bb4758cd9ba63287 SHA-256: 6b393ce860b6f643de2dee61109b7a63eab1ee5ef25722abc7e98caeebb63a7f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which links to known malicious redirector infrastructure. The malformed stream length heuristic and ML classifier further indicate malicious intent. While no scripts were extracted, the document's content and embedded URLs strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/free-roblox-card-pin-code-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-hack-2021-legit-yt_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/glitchtale-battle-of-souls-roblox-hack-jult-31-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hair-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hacks-para-prison-life-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-bloxburg-hacks-to-get-money_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-the-crazy-elevator-free-toilet-dlc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-rs-cheat-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-shaders_GM479516143.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
font_00_sfnt_off00002e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E98 22056 bytes
SHA-256: 89c28e5f7da249ac95716351874fb06d6fb0356cca625b65f1754055e3bc9519
font_01_sfnt_off00005f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0F 18912 bytes
SHA-256: b2e85722024131a2e1056ba084f722c0e4bf562d7369d12fec47ed3b9a34e40e

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