Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ebd1710353988…

MALICIOUS

PDF

32.2 KB Created: 2021-07-04 13:43:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5fde11ee5182d0b19640b65edd4a0729 SHA-1: eb58c6b1791a8cf0251d66fe7b2fce7007f1d8d9 SHA-256: 8f8ebd171035398813aa13479dcb02f030e9528ec101226cdff0693d441fdd03
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as offers for game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a visual download button lure further support this. The primary attack pattern involves tricking the user into clicking a link that leads to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/479516143/free-minecraft-hacks-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-everything-free-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/gkt-hacked-through-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-nike-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-gamepasses-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-conseguir-robux-con-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-new-catalog-items-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cheats-for-doengeon-quest-in-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-de-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-account-generator-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/2021-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-vip-in-miner-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-generator-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-death-run-roblox-2021_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_off00002d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D53 21300 bytes
SHA-256: b2b7d39813fc79cc306ec146cee61fcb3bea5dd469c33ba65aa7411781dcdac5
font_01_sfnt_off00005bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 18024 bytes
SHA-256: 8f8fda7ec61391a8021437fea0b23093d98da4680992c9daa6c8728c6d82e4f2

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