Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23fb0b5d90c2747…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 12:04:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bee4238048993b5d567752dd1a2b1900 SHA-1: be6d13525c18ff42a6bdef8f55204fe31df9f205 SHA-256: a23fb0b5d90c2747cdaea7f29951a5659e873f5d7f62d2fb2f25f70dc4393f2d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector infrastructure, disguised as game hacks and free item generators. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the embedded URLs and link farm structure strongly suggest a phishing or scam campaign.

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.
  • 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.
  • 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.tw/app/406889139/coin-master-invite-friends-free-spins-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/admin-commands-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-without-verify-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/install-roblox-free-latest-version_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-black-pants_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/da-hood-hack-tuto-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacker-kolorowanki-do-druku_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-generator-for-robots_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_002_off00003014.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3014 22584 bytes
SHA-256: d93deac8584a23d13da5ab8c0bf9b51ca74fde3c0a2908b5a7ef50e9add09601
font_01_sfnt_off00006269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6269 18464 bytes
SHA-256: 0edd4b42a4eaf7578d93547820b505cfd877f3b4872ccc3a0afbf0a012a885aa

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