Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff255cfbabbe783d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 12:52:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4567d81599307f397e507634c0c0eed SHA-1: 57d5faaa920bc7c2ce4e856f484b623ccf14929b SHA-256: ff255cfbabbe783d4cfb965fb29f0c67b93840339a0a2083890c6664865b0ad7
220 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors, masquerading as game hacks and generators. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-cards-2021-game-hack, which likely serves as a gateway to further malicious content or downloads. The document also features a large number of links to other PDFs hosted on digilib.unbari.ac.id, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-free-cards-2021-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-download-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-script-executors_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/black-t-shirt-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-adopt-me-bucks-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-pet-simulator-jump-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-gift-cards-free-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/www-free-robux-club_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-cheat-engine-bypass-august-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-accounts-i-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/bux-free-robux_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_002_off000031c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C4 23028 bytes
SHA-256: b5b6bd9a1fd69e0258870d9428bf125b051eabe595798b8fa6dfcea1c13f7a0a
font_01_sfnt_off0000657f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657F 18572 bytes
SHA-256: c7c6b5308b99ccf270039ea55d24bc5e0971ec03e908c39e2cede6b8a1ed74b7

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