Malicious PDF — malware analysis report

Static analysis result for SHA-256 071190357ecb346a…

MALICIOUS

PDF

45.1 KB Created: 2021-06-07 19:35:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 116ac3343f471e57a0269bceaaa600d2 SHA-1: 252a45eb94e38839386d744aed998114c12ddf6c SHA-256: 071190357ecb346a57b995e5a6b45ddca4e61339e1d6760fa349509057afdaee
182 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. It uses a password-protected-archive lure. 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 0.9865

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-hack-account-2021-free-game-hack PDF link annotation
    • http://ims-77.fr/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/how-to-hack-strength-in-roblox_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/free-roblox-money-codes_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/tiktok-free-views_GM835599320.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_off00004e3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E3F 27004 bytes
SHA-256: 8317fc4a28838c7df1f7b8656748f2d188567d33661cbfa2022a59d1e2c1d122
font_01_sfnt_off00008b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B74 18992 bytes
SHA-256: 5a4bd8a6576d143237b7ed2380cd822e6d96203d6e66594a43e3412757bf2c9a

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