Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d56c502139fa81…

MALICIOUS

PDF

51.5 KB Created: 2021-05-11 06:07:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b24ef217a1be4522bf4d81628cc5d514 SHA-1: ac1af434584dd42d6227fa7995baa39aafb2c69e SHA-256: e5d56c502139fa81d5d115a5d0c868ce2ba3d8e26d445b309cc0ad37c64b43a9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and free item generators. The document body and heuristics indicate a lure to trick users into visiting these sites, which likely host further malicious content or facilitate downloads. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to compromise their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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.xyz/app/431946152/roblox-games-with-free-vip-servers-game-hack In PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-spins-2021_GM406889139.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_off00004a3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3A 34436 bytes
SHA-256: 84529a2f83d9ccc1a663a1293782c9c8ea55fe3be922ee027c7898112d6b77d0
font_01_sfnt_off0000970b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970B 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B3 19448 bytes
SHA-256: 7f710df973ea6b199c1d8a9eebfc78f33dea52488aae7810c2817cc78585c0c8

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