Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2d0f6ab8d4f636…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 01:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc72913c1fadec85410779cf0dd0cb1b SHA-1: aa37fdb21cae80dacc5fca4d9ec0f8df71204df2 SHA-256: 6a2d0f6ab8d4f636ff461de71a46028ed7c4e6195f6289e3fe1e12499dc0306b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure of game hacks and free currency to entice users to click on external links. These links lead to a large number of other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-game-hacking-tricks-game-hack PDF link annotation
    • http://e-lib.smaxaverius5.sch.id/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/pubg-uc-online_GM1330123889.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-make-a-group-on-roblox-for-free_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
font_00_sfnt_off000030a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 22556 bytes
SHA-256: a0b7e8fa5a2f65a543a7c526a3baa7c55eb1878eb51aacf274e3ff512d84e177
font_01_sfnt_off0000629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 18264 bytes
SHA-256: 4c5f3e5f965961006c3ef101f0d270ac3d1ae38296427d466ad59c3e8bba8268

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