Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deabe766055a2cd…

MALICIOUS

PDF

34.5 KB Created: 2021-07-10 01:07:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a387874c2d299ee98c5434d9d26a4975 SHA-1: 38757f74b9461708cf34c28a3e423355177dcb24 SHA-256: 5deabe766055a2cde5a263afa01359ec323255881ad1d9e05f32be1eb5a0f77a
142 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as game-related hacks or generators, such as 'bad-minecraft-free-game-hack'. This suggests a lure to attract users to potentially malicious websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, likely for SEO manipulation or to host further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/bad-minecraft-free-game-hack PDF link annotation
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/what-is-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/rbc-points-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-bloody-mary-game-cheats_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/get-free-robux-now-free-robux-generator-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/cheat-roblox-dongeon-quest-installer_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/best-free-roblox-plane-game_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/dansploit-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/completely-black-pants-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/cheat-roblox-soros-resataurant_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-obbys-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-how-to-hack-accoutns_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-hack-apk-download-pc_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_off0000315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315E 22708 bytes
SHA-256: 2e4ea50843eee26ca43dedf5b8f7ba9f8c0b2ff0ff5c1400474d9e97cfbd0c8e
font_01_sfnt_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 18248 bytes
SHA-256: 4aba1dd6cc01965d6b6215da11c039b33948f2b192d52beaea5b71c00603ea7c

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