Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0bc733be588fae…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 00:33:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 995b13f8b1a45a3f0ca25822635eef1d SHA-1: 161d3ad03a51375d800eed9784be3b186a2f1872 SHA-256: 7c0bc733be588fae5fc7755c6344e134888a8daa42bde5a67f1f617be9d48789
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular mobile games like Coin Master and Roblox. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many SEO-optimized PDF links indicate a link farm designed to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/coin-master-daily-free-spins-game-hack PDF link annotation
    • http://www.imwd.it/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/real-robux_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://www.imwd.it/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/wurst-112-2_GM479516143.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_off00004bcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BCF 25176 bytes
SHA-256: 6ea837f0a714c96941619834f34df25972eb3a8e01909b33f75c8a1bfb974623
font_01_sfnt_off00008547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8547 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF8 18308 bytes
SHA-256: e42bde5f0ce420544e36e42831a39ceefa2103814e02a0c87b67b282abd28734

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