Malicious PDF — malware analysis report

Static analysis result for SHA-256 5397ec3ac54eb491…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 05:16:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3e5c248272c033ae9f2a01881c187314 SHA-1: 61d6ccc31588180a18c0fdef370f1d0eacc05ad3 SHA-256: 5397ec3ac54eb49154bc05e7e775d380e6973e35e31f2b0a081d813854aa1bfc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO link farms, suggesting a malicious intent to drive traffic to potentially harmful sites. The primary lure appears to be related to game hacks and free in-game currency, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-to-get-levels-in-elemental-wars-on-roblox-game-hack PDF link annotation
    • http://slims.abulyatama.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/fun-games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-welcome-to-bloxburg-beta-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-model-death-star-roblox_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-hack-999999-robux-pc_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-redwood-county-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hack-android-no-root_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_004_off000055f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55F8 25796 bytes
SHA-256: 5c70866b54d6dae5e55d6c089eff9d43df63d3f6fd2620887fc4452a8a7a1f10
font_01_sfnt_off00008f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F86 18860 bytes
SHA-256: 188c6735b42c2dd8fabebca241fe74e5b21635729dc7e9a3687d63055838b84e

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