Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fedba2308f3c34e…

MALICIOUS

PDF

43.1 KB Created: 2021-05-15 11:04:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7b23cd969c6607fd74f304d6a7750dcc SHA-1: 0d4c5a1a942001fb2e8d1a246e8dbb571b6cdc6d SHA-256: 6fedba2308f3c34e1516b3147697a806bfb5ebbce021ff99dc2a2d2b766146cf
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and links to a redirector URL that promises game hacks and free spins. This indicates a social engineering attack aimed at tricking users into visiting malicious websites. The embedded URLs suggest a phishing or scam campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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
  • 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.xyz/app/406889139/get-free-spins-coin-master-2021-game-hack In PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.bayrischestaferl.de/images/coin-master-free-spins-2021_GM406889139.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
stream_003_off000049ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AB 26732 bytes
SHA-256: 057d7f1a6edb2fddf7708a8f9853daad2f3ab27b3243b278d20ffa4db54dc63d
font_01_sfnt_off00008628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8628 18288 bytes
SHA-256: b38ddf3080d7f2bc752da259c3b03eae0df146b085052c6419baf797dcf0dadb

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