Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08d6493fae46f6b…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 04:23:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c7ddf7d14870ebeec06d77010cde0146 SHA-1: 19458d963cb391f22082bb8c5da385a7357f1463 SHA-256: f08d6493fae46f6b36346ee2cb7e5821c1d146e97f80e38184f3c4d2f04529d2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/how-to-get-free-robux-2021-on-ipad-game-hack PDF link annotation
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/pubg-uc-kaise-khariden_GM1330123889.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-2021-robux_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
stream_004_off00005240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5240 24784 bytes
SHA-256: 6aa1fc080751e10a6d3d43cd0551972d484a7952882b4e9a4e23016548c2020b
font_01_sfnt_off00008b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B58 19260 bytes
SHA-256: a36bb4ac8fe5f7694e4794165bdbed2a85abe4714979b8ed225ad366bc81ccc8

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