Malicious PDF — malware analysis report

Static analysis result for SHA-256 7690c3bba2d7419a…

MALICIOUS

PDF

44.8 KB Created: 2021-05-20 00:42:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: afa64de78aa015faf6314ad3f1f422f5 SHA-1: 2fc4e316ad728c49be7f0255b1a29f4f5b2db625 SHA-256: 7690c3bba2d7419a23e9c38aefc8252ad3984c5ab157f6b074ce902cc2da79a9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are SEO-optimized to appear as legitimate resources for game hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users to potentially harmful websites. The presence of a 'hack-to-protect-village-on-coin-master-game-hack' URL further supports the lure of illegitimate game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/hack-to-protect-village-on-coin-master-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coun-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coin-master-spins-blogger_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_003_off00004ad5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD5 24516 bytes
SHA-256: 595f8c46f6121e7108f99721358df3980b8f1be0a01f84eab178f70179d7318f
font_01_sfnt_off00008255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3F 18368 bytes
SHA-256: d6679102133a2002bfb5d521323467f00363df482f5150c6da4fdb9b85ad9332

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