Malicious PDF — malware analysis report

Static analysis result for SHA-256 0814644a822d4287…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 07:44:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 285df1b5732f3a5149aa6a6916ae1246 SHA-1: aa05de0ea0eef1e80808e018bf170f1129bdab24 SHA-256: 0814644a822d42870426cfc5f7090b85334482567ee3fc2a2f7cdb87d1d32187
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 0.9748

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/roblox-hacks-injector-game-hack PDF link annotation
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-youtube-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/hacks-for-roblox-the-mad-murderer_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/codes-elemental-wars-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-robux-hack-no-verify_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-promo-codes-for-robux_GM431946152.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_004_off00004f95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F95 24284 bytes
SHA-256: 45e9907848d143c23e0f417d6eb68e485baefa9d6dccc7429b82f0f83db4bb11
font_01_sfnt_off0000874f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874F 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off0000914c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 18476 bytes
SHA-256: a5c642f591b8018f30c6f3c11e5927f7d0f09aa19352e2904c4311b55adc1835

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