Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c27ed5a87674e5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 19:57:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2b53a577d3fef1c4ea197efb567837dc SHA-1: a0c6b120dab77a09631f6d18eec0626f385a052a SHA-256: 28c27ed5a87674e5c3089b5c4a20dc41540e1442905675242480ed98c8ef2b2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is http://netcdn.tw/app/479516143/free-minecraft-wallpaper-game-hack. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting these sites, which likely serve as a gateway to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-wallpaper-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/donate-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-look-awesome-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-clothes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-bandit-simolator-hack-infinity-coins_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-account-roblox-with-link_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-robux-bc-accounts-codes-more_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/giving-people-free-robux-live-stream_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/dantdm-com-free-account-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hacking-peoples-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-android_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_off000033b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B1 22596 bytes
SHA-256: d96c32e82a30a530605fc39f86f4b0c93811b2a4a4e08b7202f5725e066ec701
font_01_sfnt_off000065ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 18304 bytes
SHA-256: 4d587039156ed044efa68da2e07a531ede57de6bcf94accf984a6e3449228bdd

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