Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3957586c1b1c210…

MALICIOUS

PDF

42.6 KB Created: 2021-06-07 08:52:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0b7db5801997e94912e6f936aa7aa7d3 SHA-1: e3666aadd4066000aaedd7b16658d763d0c88a80 SHA-256: a3957586c1b1c210e8ce5a72a9760c30f8569607b761a6778ac36813284258e5
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on 'amatq.ca' and appear to be part of a link farm designed to attract users searching for game hacks and free in-game currency. The document also displays a fake CAPTCHA or human verification prompt to trick users into clicking these malicious links. The primary redirector URL is https://netcdn.tw/app/431946152/free-robux-oin-1-sec-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 6

  • 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.
  • 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/free-robux-oin-1-sec-game-hack In PDF document text
    • https://amatq.ca/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://amatq.ca/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/new-hack-roblox-2021-rbx-june_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/mega-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://amatq.ca/images/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/free-roblox-wings_GM431946152.pdfIn PDF document text
    • https://amatq.ca/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://amatq.ca/images/microsoft-free-robux_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
stream_004_off00004c4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4E 24508 bytes
SHA-256: 5cb3396793e419dfc954b017ccef3556a2360c7b310841182210068ec0bbdd92
font_01_sfnt_off00008417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8417 18240 bytes
SHA-256: adb244240fc5346541653e763e5a03f80638293f9eb9cf3f77d8a17ea429a145

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