Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8873e32b445b31…

MALICIOUS

PDF

44.5 KB Created: 2021-06-13 23:52:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 063134013854ea5be5e6dcacb1ae71ad SHA-1: 31c1fe24d9bb3d96e074e9fc7d5a315d379c9038 SHA-256: ef8873e32b445b314b94353a6b31d5834b8c3d2d06c98c4a236f7f7801f60e26
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a malicious redirector link disguised as a 'game hack' lure, which is further reinforced by a fake CAPTCHA prompt. The document body and embedded URLs suggest an attempt to trick users into downloading potentially malicious files or visiting further compromised sites. The primary malicious URL identified is http://netcdn.co/app/431946152/hacks-for-roblox-v5-fast-and-furious-updates-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hacks-for-roblox-v5-fast-and-furious-updates-game-hack In PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-build-a-boat-hack-nopde_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-person_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-hack-giveaway_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/robux-sites_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-pe-hacks_GM479516143.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_off00004930.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4930 26772 bytes
SHA-256: d3ab47c4ebdfc74450378a8a128c951586a7263ef70f1d4acc554ce1394435b1
font_01_sfnt_off000087c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C3 19512 bytes
SHA-256: 5eb7507901de6f0d4045cc75db83be5a6661c0294617f1ad3bcef6e786510d54

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