Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc07bacf66ec45c…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 11:41:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 95c60fedbfa7a97832c9fe22a9f8b7fe SHA-1: e635972ef890bbc0ca523cd1b169d158cfe14a76 SHA-256: 9dc07bacf66ec45c55ab35dc16fe1fa16f2ab3fcfe5c873a48d84aa9599abe84
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as lures for game hacks and free currency. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with these links, likely leading to further malicious content or downloads. While no scripts were explicitly extracted, the nature of the lures and the redirector links strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/medieval-hood-of-mystery-free-roblox-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-promo-card-code-list-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-cheats-blog_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-welcome-to-bloxburg-money-cheat-august-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-fan-page-facebook_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
stream_004_off0000522b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522B 25388 bytes
SHA-256: 6e97a5c0f091b8867a898dcda42b508dfc1805196c5bc4c068537e47c498c472
font_01_sfnt_off00008bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFB 19064 bytes
SHA-256: bb2cc9fe89837909d612113cec51db5a0fb76e66967cf33aaf166cc0a7c6aea7

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