Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a96cfe2895cd10…

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 14:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0a4d48a4d762308caac0b3ddcbe32f98 SHA-1: 0ec6a45f533f626773a44f165773c1362a20c67c SHA-256: 27a96cfe2895cd10d32e9ac2b190f527ab177987b8d29685bc1a158f20debe1d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of game hacks and free currency. The document body and embedded URLs strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a high likelihood of leading to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/minecraft-bedrock-hacks-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-pocket-apk_GM479516143.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/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-mast-hacks_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
stream_003_off0000493a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493A 25100 bytes
SHA-256: 7947e3d32b85900aab524f633b6e45399738c740f71ba38098e465b948d9fa62
font_01_sfnt_off00008277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8277 18268 bytes
SHA-256: cdc10c07562964e95d3c60cab3c6d937b43618c1a43ea86bc4060c2923515875

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