Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1b71fa302378c7…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 09:45:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 36bbd7b716b01c7eccf65355008f386e SHA-1: c7c5d4ee095f45f47b85127cf0b7335128b7e6b9 SHA-256: 5d1b71fa302378c7f98a3dc1c9230ad442b6a8591dfc0797e4233a36ecd745f0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files hosted on the 'perpustakaan-stikesmsb.com' domain, suggesting a link farm or SEO manipulation tactic. The primary lure appears to be related to game hacks and in-game currency, as indicated by the document body and heuristic firings. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/406889139/village-3-coin-master-game-hack PDF link annotation
    • http://perpustakaan-stikesmsb.com/repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9A 24264 bytes
SHA-256: e9d90c2bac71fdd66e074c489e9f3d9dba5da1ed988656b596b85b3d49860ac1
font_01_sfnt_off0000870a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870A 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000090bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BC 18216 bytes
SHA-256: b1b00e9a7d41aa718c2a53fd3f5d6ec11507194a196a1a07c5c67219da45c191

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