Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78457c377574b42…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 09:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d07fe3597fb976be61ded1c82c452213 SHA-1: 943377ad3d58cdb66fd9c1c85c07bb16842e6936 SHA-256: b78457c377574b420020ef4b917c2eb9e50c1703a2703a416823fc1fe105325a
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 a 'free generator / game hack' lure. The presence of a fake CAPTCHA prompt suggests an attempt to trick the user into interacting with these malicious links, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a malicious intent.

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/xray-for-roblox-for-hacks-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-roblox-valentines-cards_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/hack-lucky-blocks-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-generator-2021-robux-hack-no-survey-updated_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/pahto-forces-roblox-rank-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-hack-client-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-exploit-scripts_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_off00005027.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5027 27228 bytes
SHA-256: 31ea35fc930f5515dbcbbefd53468f71c8c97ec0dbb0894f09f8ee812c714563
font_01_sfnt_off00008e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E51 18528 bytes
SHA-256: 5be9c5dbcd689be28fb9b714d946cbddc5c57c903dc4b6bb426a8b37a6f67c8b

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