Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a4e41a174105fd…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 07:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4989b426172b7187ac1653459adc062a SHA-1: 250bad5112f74807ef5ac4059a9fd6ef4520ca81 SHA-256: a7a4e41a174105fd8d7d5f22983daf0585152417f92d6bd08697b0615ed3cd13
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link, which is designed to redirect them to a 'game hack generator' website. This behavior is indicative of a phishing or scam attempt, likely intended to lead to further malicious activity or credential harvesting. The embedded URLs suggest a campaign focused on popular mobile games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/coin-master-free-spins-hack-iphone-game-hack In PDF document text
    • http://bishopdiego.org/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/client-minecraft_GM479516143.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://bishopdiego.org/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://bishopdiego.org/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://bishopdiego.org/images/how-to-get-spins-for-free-on-coin-master_GM406889139.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_003_off0000485e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485E 25108 bytes
SHA-256: 2b7993794b1f434943aa79a85f76d920d54eac293efd856872dc399808950a57
font_01_sfnt_off0000828d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 18220 bytes
SHA-256: 1dfaaa5fda009d523ba1163bf16545e2c66f7621c16cb7ff5e9bef64f998ba72

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