Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b7a558b35f35f0…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 03:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bb521720f077f9855c90e8c57ed53b2 SHA-1: ab68c32faddcefe28806abfc8bb91d314dbc9c9e SHA-256: b7b7a558b35f35f0aca87f273964705b6ad9ea8bdec9630a11d8f74648885a32
142 Risk Score

Malware Insights

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

The PDF contains multiple lures related to game hacks and free spins, directing users to external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content-spinning operation. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the structure and linked content point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/daily-free-spins-game-hack PDF link annotation
    • http://repository.poliven.ac.id//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-robux-without-any-verification_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_003_off00004a60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A60 23900 bytes
SHA-256: e53024c4f6499da90e4396fd311a8a46bbc5e6bb0d721523eaf9a8b735a2ddac
font_01_sfnt_off000080fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FE 18064 bytes
SHA-256: c13d24b09dacab53a31a9a34c8affe100c305689843df97e3c31ade46cbd1ed9

Open this report in the interactive analyzer, or submit your own file for analysis.