Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd01c057ca6a923c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-07 09:46:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 74c072e7f93a38b637fff55950055e32 SHA-1: 77642e228cdf65ef178103a2bca3b7cf67ab0227 SHA-256: dd01c057ca6a923c23c4107b1c756cb93210642f5b5c1a0a609ecdb69d9b416a
200 Risk Score

Malware Insights

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

The PDF document contains a link disguised as a 'free generator / game hack' lure, which redirects to malicious infrastructure. It also displays a fake CAPTCHA to trick users into interacting with the content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/lazyblox-com-free-robux-game-hack In PDF document text
    • http://zarinnameh.ir/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-scam_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/tiktok-free-fans_GM835599320.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_off00004fbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FBE 25596 bytes
SHA-256: b15268a20e134af1f5907254cca2c510a758f005b756433410b3c60e984e4858
font_01_sfnt_off00008ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD1 18840 bytes
SHA-256: c7a12f46af2ab2e47f5138dce66a585f9a7928693d977e55c66cac0a0236f754

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