Malicious PDF — malware analysis report

Static analysis result for SHA-256 f341c8a2afabe775…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 18:39:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 920c70354fd21cfbc8e21640f5c3073a SHA-1: 33be19e57e834597c6b03405d32f54ee54ba7a67 SHA-256: f341c8a2afabe775a025891560b3cdc47586389e94510b395fdb4752b3583d8e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a primary redirector at http://netcdn.tw/app/479516143/minecraft-account-hacked-game-hack, which is flagged as malicious. The document body and heuristics indicate a lure for game-related cheats or free items, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure suggests a link farm designed to lead users to potentially harmful content.

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.
  • 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 http://netcdn.tw/app/479516143/minecraft-account-hacked-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-freer-package-roblox-2021-july_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/eviction-notice-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-a-roblox-account-august-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-god-yourself-in-roblox-not-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-resorts_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/mad-city-hacks-roblox-windows-7_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-legendary-football-vip-server-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-items-that-hack-your-game_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-download-roblox-hack-apk_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_off00003225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3225 21944 bytes
SHA-256: 798bfc3fcd18d747f1a1bfdee01ea7bd4556d657068ca8e45e738119e2003129
font_01_sfnt_off0000626e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626E 18484 bytes
SHA-256: 5dd05c9cb448aa3988e40803526fd1466b4ff4df0b75d5f1fead4c9123013b57

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