Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb9853ddd2478c3…

MALICIOUS

PDF

51.7 KB Created: 2021-06-04 02:13:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1c427f4b697d072cf5601c0ac72853d0 SHA-1: 257395de157c27fc8ed7762767af0aa7cd1842cb SHA-256: 1eb9853ddd2478c3d511d54945904d1eb280366763cee420308d0127153dec43
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1204.002 Malicious Link

This PDF document employs a lure to trick users into clicking a link that impersonates Facebook and promises free Robux or game hacks. The primary link directs to a known malicious redirector, suggesting a credential phishing or malware distribution attempt. The document's structure and embedded links indicate a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.online/app/431946152/how-do-we-get-free-robux-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.online/app/431946152/how-do-we-get-free-robux-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/tiktok-free-wala_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C4 24572 bytes
SHA-256: 4500cfe0c4fa417920a245075200f3e79c3501d315d081eb6963305e79305aad
font_01_sfnt_off000089d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D6 8704 bytes
SHA-256: 39621d468ee1ea45cfd77c2a5e31c688636f452f9f0cc0d9213932d691ddc971
font_02_sfnt_off0000a641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA641 18648 bytes
SHA-256: 357fc7c7eb6196ee12ed3080908575177554d85b467bf9142ee0ee232c3cf829

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