Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5ef5bca4a27436…

MALICIOUS

PDF

34.0 KB Created: 2021-06-19 19:07:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 713b88ea0fd00ab68f0c8ecfa7b9e664 SHA-1: 8b266e087b36b65f064e9ef5b280014b09743bd1 SHA-256: 6a5ef5bca4a27436b6f35b0d9eb3ad2be2788cfd97c0764e27faf01b308abc3c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for game hacks and free in-game currency, directing users to a known malicious redirector. The document's content and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/cheat-dungeon-quest-roblox-20s-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-download-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-compagnon-roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/big-brother-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-human-verification-on-ipad_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/getbucks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-mining-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_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
font_00_sfnt_off00002d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6F 22064 bytes
SHA-256: 0022e89136d6e4c44b53cb430e044298dcefb529a2b0d168631573063a9d9772
font_01_sfnt_off00005e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 19520 bytes
SHA-256: 76187c29a53fd622657b058b7027c53d6f3dabee1759def2890ad874f0fc12b7

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