Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d062d60fc0e881…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 19:59:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 22a7cfafbe78a55e6b57e1466876c316 SHA-1: 52435d122812fe19dbf52d6de9cae7f6b45cab44 SHA-256: a3d062d60fc0e8812374053077cc63e03b1c8af232df3bc836e4650e2820613d
122 Risk Score

Malware Insights

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

This PDF file contains multiple links, with a primary URL pointing to a 'free generator / game hack' lure. The document impersonates Office 365, attempting to trick users into clicking the link, which is hosted on a domain unrelated to the impersonated brand. This suggests a credential phishing or malware download attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.online/app/479516143/free-minecraft-skins-ps4-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/479516143/free-minecraft-skins-ps4-game-hack PDF link annotation
    • http://www.rewaqousha.net/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-com-real_GM431946152.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_off0000520e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520E 25896 bytes
SHA-256: 6a20aa6261f2b1709fabdae4eb02863a75c29b3e4b38646b0e5c2f18dc48d01d
font_01_sfnt_off00008d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D35 17956 bytes
SHA-256: f16184d131abb73dd8cdf0449b410f67b95b3645fab407bf2b051681382e3c16

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