Malicious PDF — malware analysis report

Static analysis result for SHA-256 6199758220db8548…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 11:04:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 617c243a4ee9e3c53167d694ffdd2c27 SHA-1: 855203731af0d8f021471f470515c87a2f1fc7fa SHA-256: 6199758220db85489f354fe5834818c9746f91ea6b748408459400e166f0cb9e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs reinforce the lure of free game-related downloads, which is a common pretext for malware delivery. The primary IOC is the malicious redirector URL used to host the payload.

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/431946152/krnl-download-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/any-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/100-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-free-hats-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/how-to-set-skybox-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-free-nonskid-exploits_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/thebuxian-get-roblox-ninja-animation-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-codes-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-obc-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/guess-the-logo-cheat-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/my-boyfriend-cheated-on-me-with-his-ex-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-foxy-food-coin-master_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_off00002fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBD 22696 bytes
SHA-256: a826e645d27607feb49d91b5cc26a06ddf098581e27cfe9776652af9f58de3f8
font_01_sfnt_off00006262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 18624 bytes
SHA-256: 20406726f239ebf0548ecdd77ef81ade18ad655bc1c7103998a038ecac567153

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