Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b9b57d8d2ba085…

MALICIOUS

PDF

34.4 KB Created: 2021-07-07 22:10:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: edc0bfcf401e95db3b8263ef7518e429 SHA-1: 17038dbe0b3761989845abe014a0c394bb2045ca SHA-256: 15b9b57d8d2ba085014eb891f7ae1bb2544516b67956e8629ffee086cd075d02
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on `pustaka1.unindra.id` and appear to be part of a link farm designed to attract users searching for game cheats or in-game currency. One primary URL, `http://netcdn.tw/app/406889139/free-coin-master-account-game-hack`, is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL and references to game hacks, reinforcing the lure. No scripts were extracted, but the extensive use of redirector links and SEO-optimized PDF names suggests a phishing or scam campaign.

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/free-coin-master-account-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/add-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-roblox-bots_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/when-tiktok-free-views-and-likes_GM835599320.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/5-games-that-promise-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.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_off0000316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316C 22772 bytes
SHA-256: aa9f955c803bb4732d69f4f063ba2cf96beb324680e41ac443e51846feba96fe
font_01_sfnt_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 18140 bytes
SHA-256: ca77f048189f6b42c4087a98757a7b7ee8d42f0b46b1d7450a305d57abf2558b

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