Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e128bdc24dc56fb…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 08:13:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c28244ad7e7b898541c9f78624fbd76f SHA-1: 0c576de72b9bd040b68f8a7d3f1f53798cc33c9b SHA-256: 5e128bdc24dc56fbb9559267f55d9d9a4243be6a1441fd9bb1b164a1251e6788
182 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with embedded links. The document contains numerous links to external sites, many of which appear to be part of a link farm designed for SEO manipulation, promoting game hacks and generators. The ML classifier strongly indicates maliciousness, and the overall pattern suggests a phishing or redirection scheme to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-get-free-robux-in-jailbreak-game-hack PDF link annotation
    • http://solidkom.ch/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/how-2-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/roblox-free-hair-boy_GM431946152.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_004_off00005090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5090 25904 bytes
SHA-256: bfc3956be0fb0f6fa404393f1ed88fd16afc676ff682a0f367306ac886689c81
font_01_sfnt_off00008cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A06 19040 bytes
SHA-256: 056248a534aea3cedbf2c29122359cb80b6ca4e68269cea481246f72ba5ca033

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