Malicious PDF — malware analysis report

Static analysis result for SHA-256 4621728a390924e5…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 10:09:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f108184173e115fbfbcf47356e0cec25 SHA-1: 4fd2e099ecfea58296ab5f6d4a7ad0b242ffdc3d SHA-256: 4621728a390924e56c094a4d8847b402437b12b60dbd94d0383cbd396670b404
260 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, including a known malicious redirector, disguised as game hacks and free item generators. The 'SE_CLICKFIX' heuristic indicates the document may instruct users to execute commands directly, likely to download and run a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.online/app/479516143/is-minecraft-free-on-xbox-one-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-for-free-download_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-i-get-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000552b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552B 25512 bytes
SHA-256: 34aa7b9f636cffa4eb8c85c8774c4e7b967c8653ee73a844788c8dde1e091906
font_01_sfnt_off00008ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED1 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off000098df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DF 18304 bytes
SHA-256: 19d9535fd2d352d2586ba99854d4ae80d513f2901e16ae506060a78b50b635a9

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