Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9c7ebc37624835…

MALICIOUS

PDF

42.7 KB Created: 2021-04-25 09:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 65b9b5d162f284f7724969a022d65036 SHA-1: bcf9fbbeebd26c2d2b81afa8db75554093797cd5 SHA-256: 3f9c7ebc37624835721f6bb7d9bd5df12393e1c8d34906d687ad9cd1082bac68
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file contains multiple links to malicious redirectors and impersonates Microsoft to lure users with a 'free generator' or 'game hack' theme. The primary link, https://netcdn.xyz/app/431946152/redeem-roblox-cards-free-codes-2021-game-hack, is identified as a malicious redirector. The document's content and heuristics strongly suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.xyz/app/431946152/redeem-roblox-cards-free-codes-2021-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.xyz/app/431946152/redeem-roblox-cards-free-codes-2021-game-hack In PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/hack-roblox-robux-generator-no-human-verification.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-ipad-or-phone.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/roblox-dead-winter-infinite-hack.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/roblox-how-to-get-free-clothes-2021.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-stuff-from-catalog-on-roblox.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/roblox-robux-hack-without-human-verification.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/cheat-codes-for-roblox-mad-city-cash.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/roblox-afk-saber-simulator-hack.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-candy-roblox-id.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-download-hacks-in-roblox-high-school.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_003_off0000462c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x462C 26852 bytes
SHA-256: 0f768bf381bc79f85506e38650cb5c1e35593f991023610907af411a585a6b15
font_01_sfnt_off00008328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8328 19012 bytes
SHA-256: d8df87e3dab4edb461d2e9eb6baf221e365244229538c51758bb0e4279c0c75a

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