Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d60e856cea0eab9…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 08:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 57163da07c148961962a9f935dd83acb SHA-1: a9e05299ac5ea68c513eb3febba95fca1c263872 SHA-256: 5d60e856cea0eab9e147097eadcbea26da82f220b5778c39c185605000c4085a
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as free game hacks or generators. It also presents a fake CAPTCHA to trick users into interacting with the malicious content. The primary goal appears to be directing users to potentially harmful websites through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/robux-codes-2021-free-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/which-pokemon-go-free-server_GM1094591345.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-name-change_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-generator-free-no-sruvey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-game-called-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-accounts_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_004_off0000500b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500B 26900 bytes
SHA-256: 994c62ee864753a1978dbf2d65aca67a42c44d985aef5c421a027366866fd2c3
font_01_sfnt_off00008c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C15 18588 bytes
SHA-256: 23f010ac78bde57f3990f4154ee8ca2c4ffe2c5f785c531000c576bbd85134e8

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