Malicious PDF — malware analysis report

Static analysis result for SHA-256 586bd874633ef6d4…

MALICIOUS

PDF

46.3 KB Created: 2021-05-21 14:33:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 123177a8e9e9b131fd35441e65592950 SHA-1: c93dac3a8d77b2c89ea87656ec4334380e706bfa SHA-256: 586bd874633ef6d45d47851ec195c1f07605305f6c72d6e9ec9682c384a2112d
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7710

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.xyz/app/479516143/can-i-play-minecraft-for-free-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.xyz/app/479516143/can-i-play-minecraft-for-free-game-hack PDF link annotation
    • http://halal-center.ru/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://halal-center.ru/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://halal-center.ru/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B4 25040 bytes
SHA-256: 8d4752576eaac390f156c3700d855f6f333759b204cb9e349db95386d759e36b
font_01_sfnt_off00006c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 7996 bytes
SHA-256: 8fa9cfafa32e448e8eb1b0558076729ecb319213bacec7786e22d84152ccc30a
font_02_sfnt_off000085ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CA 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off00009457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9457 18116 bytes
SHA-256: db9fb042e323340e2a38fe4918690f75e213c2b358d2fbab9da01db426307a9f

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