Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c7b21d0a1773fd…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 07:16:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 388516de7604f75050df27cb617946e9 SHA-1: 277ae639dc8abe9f765805a2d1ab5ab369704ccb SHA-256: 41c7b21d0a1773fd034244adba5b5b5a7a8073145520f117dc0ce1cf39eae365
260 Risk Score

Malware Insights

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

This PDF document contains multiple links designed to lure users to malicious websites, masquerading as free game hacks or generators. One prominent link redirects to a site impersonating eBay, indicating a credential phishing attempt. The PDF structure and embedded links suggest it's part of a campaign to exploit user interest in freebies and popular brands for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-roblox-website-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/free-roblox-website-game-hack In PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-roblox-hair-boy_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_003_off00004a33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A33 24840 bytes
SHA-256: 1e3056e76c0418d2960cb901efb789d3892406bfa20b0a75edca57693ebeb589
font_01_sfnt_off000083f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F8 18372 bytes
SHA-256: 4f49704c3d2016fd3d486e698c5af7a9a5561cf776b84bb9dfcb3ffa887994c7