PDF malware analysis — malicious · cc49ab2737c6ede5

MALICIOUS

PDF

227.8 KB Created: 2021-07-05 02:58:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25

MD5: ab938782f20b5be72c870dcc3f4c2476 SHA-1: 537cdddb5d3943efcc919de36ce89522400cba34 SHA-256: cc49ab2737c6ede598a7f2387b8439683fcc5baa1ec8cb8c017672e8e264546f

250 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors, disguised as game hacks and free generators. The document body and heuristics indicate a lure to trick users into clicking these links, likely to download a second-stage payload or install unwanted software. The presence of a fake CAPTCHA and browser extension lure further supports a social engineering attack. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

Nyx PDF Classifier clean score 0.0118

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
Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE

Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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 http://netcdn.tw/app/1094591345/pokemon-go-hack-free-download-ios-game-hack In PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/you-to-get-free-robux-no-hack_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/best-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/how-to-get-2021-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/robux-get-com_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-canada_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/hacks-master-coin_GM406889139.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-no-password-required_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- http://www.med-aid.vn/ckfinder/userfiles/files/get-free-followers-on-tiktok_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.

Filename	Kind	Source	Size
`stream_023_off000322df.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x322DF	25576 bytes
SHA-256: `516ce916c3f7bc50b539481d058a1bb9741ebc836ff8e860ea7102f936be958a`
`font_01_sfnt_off00035edd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x35EDD	18940 bytes
SHA-256: `d4f0f48febb598938ea2f876fd3bc3e25c29f6b947ff61c1248c7b6d470b10c8`

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