Malicious PDF — malware analysis report

Static analysis result for SHA-256 0613bf5b7480cfd2…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 05:56:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8265b22941fb6631737db074bfc60279 SHA-1: 214e11dff98730f17fe0454c241315bddc6002b6 SHA-256: 0613bf5b7480cfd2596152df4ae619c4e56a267bed9fe8403b87c47e8e3c4e44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, disguised as 'game hacks' or 'free generators', aiming to trick users into downloading further malicious content. The embedded URLs, such as 'https://netcdn.online/app/431946152/hacks-for-roblox-dead-locked-game-hack', are indicative of a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to lure users into a malicious download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/hacks-for-roblox-dead-locked-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/is-pubg-uc-worth-it_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coins-coin-master-2021_GM406889139.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_off00005182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5182 24720 bytes
SHA-256: f247eebe5cf747cc9694399c4e89726774d111476b667033f3f4d22cc1f0c7c9
font_01_sfnt_off000089e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E3 18688 bytes
SHA-256: dac20c3d53b9b762dbf8f0cccd4d3bbedc9610707f09e207a292d1990db97d70

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