Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9400b45feae5a85…

MALICIOUS

PDF

48.4 KB Created: 2021-06-10 16:40:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e475fe73f615a15b870e45570074cc04 SHA-1: b5486ca81840bd90c5b4be7b88c12a7bed7cc17d SHA-256: e9400b45feae5a85943ce3cf46c0cb4f7c6fed3bb9ccc5e5c7c99816c443d5e0
200 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, impersonating brands like Facebook to lure users with promises of free items or game hacks. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-items-roblox-20217-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a credential phishing or malware distribution attempt via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.tw/app/431946152/free-items-roblox-20217-game-hack.
  • 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-items-roblox-20217-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-roblox-robux-free-pastebin-com_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-coins-for-coin-master_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_004_off000050b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B1 25516 bytes
SHA-256: 5517ba0c38e4dc74c01744f70d8ba58da6435e79a2882b3dd2e3811091868e43
font_01_sfnt_off00008bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF8 3996 bytes
SHA-256: 42322dd298ea822897384c2f64ce7cc3e8f9a72246876235141d58be82d62e1c
font_02_sfnt_off00009909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9909 18768 bytes
SHA-256: 50226f28c3ec3cf3e0a647775af79c067a22547b057ecafae0ea9e39ce367d86

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