Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81daad3839b4c0a…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 09:09:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b7634317241ff12caff0b1414fb65a8 SHA-1: 00a42d863c3486b4511c7aade396a25a09579425 SHA-256: a81daad3839b4c0af4d8f2b0cb32e1e20166eca0bcd8e1e56c7a7c9ca57f2136
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The primary lure is the URL http://netcdn.co/app/431946152/hack-de-roblox-2021-diciembre-game-hack, which is flagged as a known malicious redirector. The document's content and embedded links strongly suggest a phishing or scam attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/hack-de-roblox-2021-diciembre-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/baby-hacks-in-adopt-and-raise-a-baby-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-robux-credit-card-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-card-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-1-000-000_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-bc-only_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/getrobux-info_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-free-no-pay-no-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-promo-codes-thumbnaill_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.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
font_00_sfnt_off00002f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F45 22528 bytes
SHA-256: a0f7ceb7d71f10045ab995e84f26d99d6f905a138c6e08ccd1ac54c177a31dc5
font_01_sfnt_off0000618f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 19608 bytes
SHA-256: 7453a463322f6aff2fa9a380bdbbec650990b796c357e57a699f88dee60deffa