Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab04713b488c6d9…

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 04:36:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 79bc3c8d5f82b496f9eb80bdf521a11f SHA-1: 39e15b2892897cd8def4468b730b1eac583630f9 SHA-256: 4ab04713b488c6d9b514fae696fad83e0d458f843c4ed3037155d0ee8e3a2275
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game items and hacks to entice users. It contains numerous links to a malicious redirector and a link farm of SEO-poisoned PDFs, indicating a campaign to drive traffic to potentially malicious sites. The primary goal appears to be user engagement with these lures, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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/479516143/free-minecraft-mods-for-ps4-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-anti-bot-verification_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_off00004cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFF 27724 bytes
SHA-256: 9386808308a3b3be6d16b51d48078536b108afd488c392d2096a67f8955020ef
font_01_sfnt_off00008aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEB 18100 bytes
SHA-256: afa4c211481c2918fc981f85699f534e91f71a3c97d40d186225a72223318956

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