Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a3619998a15c3b…

MALICIOUS

PDF

41.1 KB Created: 2021-05-12 17:02:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2c775767f97f2f3fc1c2bea427487e2d SHA-1: a6bd8e1d3ab01a496c037cc2b8d71347c9e11ae5 SHA-256: 58a3619998a15c3b81f91b8438e0f2ed9125527b99fae36323149367bc5c94c8
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA and a "free generator / game hack" lure to trick users into clicking malicious links. It directs users to a known malicious redirector infrastructure, likely to download a second-stage payload or phish for credentials. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-rewards-game-hack In PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-websites-that-actually-work-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
stream_003_off00004716.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4716 24516 bytes
SHA-256: 8093b50fdfd9ab6e3a2228afb0ee9879a4145a9beac46c35e7a67f51e614a7ed
font_01_sfnt_off00007f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F41 17884 bytes
SHA-256: acbd2960432ed6aaee9cffad063da1b3d43b5b4e200ce15de4e80cb136e5b59b

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