Malicious PDF — malware analysis report

Static analysis result for SHA-256 42331357f2d49356…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 19:05:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4c9459cee166ffe8dfaef637230de4d4 SHA-1: 8f56560d1297eb7c7b1aea2b3f6c91245e55b300 SHA-256: 42331357f2d493562c142b77d12dcc119afd7bd0e9e8b94bd0a9627dc0b1307d
122 Risk Score

Malware Insights

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

This PDF document employs a brand-impersonation lure, specifically impersonating Amazon, to trick users into clicking a link for 'free Robux'. The link directs to a malicious redirector, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

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/431946152/robux-free-com-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/431946152/robux-free-com-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/pubg-4-uccom_GM1330123889.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/block-best-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.nrzroblox.comIn 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_off00004dbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DBF 28604 bytes
SHA-256: a9cbc557181ff16f8d07077fe0bba7f2bbcd9c813bd97135a72e0e5b0fa2a77e
font_01_sfnt_off00008d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D94 18276 bytes
SHA-256: 0fd65c317a1abc649e3faff400e4768e1aa7d1dd6ac5589c15474ffa47aab2c1

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