Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5d127a15e5d562…

MALICIOUS

PDF

53.3 KB Created: 2021-06-10 20:53:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea50b53cac66e047d49916778aabaf47 SHA-1: 67e62a7edb43feda8ee187572626fb3eafc78ac8 SHA-256: de5d127a15e5d5623c970800bc9a1bf904fe145adbc7e18948e7736966bf82ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains references to 'Roblox Jailbreak Hack' and URLs that reinforce this theme. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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 https://netcdn.tw/app/431946152/roblox-jailbreak-hack-gameplay-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/ways-to-get-robux-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-email-rewards-link_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54AC 25284 bytes
SHA-256: 95111d61897abcd9fd4520f2dd48aeade2c72a241a6f31113a53ecdb76a5407c
font_01_sfnt_off00008f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off0000aba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA9 19084 bytes
SHA-256: b3f97c1adbf5cb055c5bf54523567533b3081bfcbba79f35cc3aa81d93958a79

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