Malicious PDF — malware analysis report

Static analysis result for SHA-256 035f0f3a491792e7…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 12:01:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4233bae496748c37afdaecefd72cf2a SHA-1: 2f9cb46a85ac91be6ecefab49db4af89a2a3d112 SHA-256: 035f0f3a491792e71d97224d38accbea8c2ce61ee754f475720736b82b0041dc
248 Risk Score

Malware Insights

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

The PDF document employs a lure of free Robux and a fake CAPTCHA to trick users into clicking a malicious link, impersonating Microsoft in the process. The embedded link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 7

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-no-verification-or-survey-2021-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/431946152/free-robux-no-verification-or-survey-2021-game-hack In PDF document text
    • http://matweb.pl/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://matweb.pl/images/freerubux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/roblox-comcom_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/wurst-client_GM479516143.pdfIn PDF document text
    • http://matweb.pl/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/freerobuxhack-us-2021_GM431946152.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_off00004955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4955 24340 bytes
SHA-256: 3768d22efaaba0236b858c96d3fa4dbc4057f04479efbda1e0c78fafc8cc2608
font_01_sfnt_off00008171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8171 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E19 19296 bytes
SHA-256: 8ae3a64377bb3499e06ef2dc6ba5ce98d8bac2a4cf46517fa6b68a3eec67b541

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