Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4c23e312211523…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 22:17:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f32e8a112f02d45f86d59befe3bdfc97 SHA-1: 4d58ab4f91d1c175ff809c93c51d2b63b8b6d37f SHA-256: 4c4c23e312211523effa1dd614edc881b2872290f054c99c2af5826104fb4fcc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The primary link directs to 'https://netcdn.tw/app/431946152/hack-roblox-jailbreak-2021-game-hack', which is associated with malicious redirector infrastructure. The document body, though partially garbled, contains similar lures and the primary malicious URL. This indicates a phishing or scam attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/hack-roblox-jailbreak-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-traversed-wall-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-admin-hack-dll_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/cheat-prison-life-roblox-escape_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-cheat-all-gun-in-phantom-forces_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/cheats-for-lumber-tycoon-2-on-roblox_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_004_off00005186.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5186 27312 bytes
SHA-256: 1480a3ad09a811806f7b1801bd4a10e866528cc73a93d06e62ea07ca40eef536
font_01_sfnt_off00008ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF6 18868 bytes
SHA-256: 7fb9ba3e486e76c20d784547730a01c968361d431c8de00ca0343ba29eb20447

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