Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd3446b75ca7c7…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 23:52:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54bdc61bba3503603daf08d406390044 SHA-1: db026c8f27665b2651be3cb2620b6eb6c1a36589 SHA-256: dbdd3446b75ca7c7cb7395bf81d438931e2a522ecfa36baeac0dc94fa40be751
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as game hacks or generators for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO manipulation tactic. The primary URL http://netcdn.tw/app/431946152/roblox-weird-game-hack appears to be a redirector for malicious content.

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/431946152/roblox-weird-game-hack PDF link annotation
    • https://www.tdbaska.hr/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/insane-jailbreak-roblox-admin-panel-hack-working_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/hacks-robloxco_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/nocliping-hack-for-prison-life-roblox_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/download-roblox-hack-for-pc_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-highschool-2-hack_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox-accounts-v3rmillion_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-roblox-account-giveaway-with-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/v3rmillion-hacks-roblox-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/hectic-plays-free-robux-form_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.tdbaska.hr/files/i-was-hacked-in-roblox_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_off0000321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321E 21884 bytes
SHA-256: c66098ac406633fd3e68de4663e45b1677d8510ee12d9e04ee69d493ce306ed5
font_01_sfnt_off0000627c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 18980 bytes
SHA-256: 13ac0480cae495feb32fdb2a0476ad0d8be4170057c69ebee87ee810c293145f