Malicious PDF — malware analysis report

Static analysis result for SHA-256 156f5db2bea376e3…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 18:16:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 862ce107a6e3d55a43c5f43ada2c1023 SHA-1: 4497ded170b1311729225e3e7933acb2552d5f13 SHA-256: 156f5db2bea376e3657fa510507bd0234034da28044c6689c585e0beee9143db
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a large number of SEO-optimized PDF links, likely intended to lure users to malicious websites. The document body and heuristics indicate a scam related to free Robux and game hacks. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • 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 https://netcdn.online/app/431946152/games-on-roblox-that-give-you-free-robux-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/are-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-link_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_off00005362.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5362 24968 bytes
SHA-256: ba832d2bc157f1c6b83bdaf06d00251d11daf60ac1e6f63c6d2180b03fe1bbac
font_01_sfnt_off00008d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3A 19240 bytes
SHA-256: 3009583106c638257969d16940e6b1d2d6c9c8cef99a9d3856a451b20885bf07

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