Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fe7013db85f007…

MALICIOUS

PDF

46.5 KB Created: 2021-06-08 23:15:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 221b77b83d5b6c0e99c996996b6d39d9 SHA-1: e1394f2bd2c789576b7059b8c0f46d4e5f7e5023 SHA-256: 61fe7013db85f0076e3ea62b163fc75299f66f0833602855f1fc3f0c71626938
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 designed to trick users into clicking a link. This link, identified as a malicious redirector, leads to a page offering game hacks and generators. The document's structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/pollo-loco-youtube-hack-roblox-game-hack In PDF document text
    • http://zarinnameh.ir/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-btools-hack-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-coins-for-coin-master_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_004_off000051e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E8 28344 bytes
SHA-256: 927072449a7c7b0de4610ccf2e996864b5286da91e8e7885c29653824ff6ed35
font_01_sfnt_off000091da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DA 18744 bytes
SHA-256: 705c30c3f6b1f979259ad62e4e86fe49113858db3505ddacb721ca8a073543af

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