Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a5374c2c0f3167…

MALICIOUS

PDF

34.9 KB Created: 2021-06-26 04:11:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bb17f3d484f34e7869a6f54e541e14d SHA-1: f6cbde1eb7c749c0b44027041ddf52c15e3cc8f7 SHA-256: 21a5374c2c0f3167ed666be789ad627519899135679162c41fd08673af9916c3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of free game hacks and currency generators to trick users into clicking malicious links. The embedded URLs point to known malicious redirectors and a large number of SEO-optimized PDF links, indicating a campaign designed to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/roblox-free-username-changer-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-pass-requiredfor-pc_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-best-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-hack-give-pass_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/is-roblox-free-on-the-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-download-synapse-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-tool-without-human-verification_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
font_00_sfnt_off0000319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319C 22352 bytes
SHA-256: e3e8c507452b2c51a0952bed42cfb708e4a25009db78b2ec8f02be92c48a1d2b
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 19076 bytes
SHA-256: 52cc9681695f56965e56832f43219c2476fbc06e79305054ad57fa71f0d37cc3

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