Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597e4cd5cac1323…

MALICIOUS

PDF

46.9 KB Created: 2021-06-04 06:45:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41166d25b8fc6844604be3e7eb17b14b SHA-1: ad063c82426cfcd5784f62c29f280b2b3e0f9372 SHA-256: f597e4cd5cac1323bd65665e429c0fcb60c6db979aa9560c7bb71aedbd1ddc73
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a 'game hack' or 'free generator' website. The primary link redirects to malicious infrastructure, indicating a phishing or scam attempt. The document body and embedded links suggest a focus on in-game currency or cheats, a common lure for such attacks. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-do-you-get-robux-on-roblox-game-hack In PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_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_off000051dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DD 27972 bytes
SHA-256: 098f2ea7419791040fe1aaf8d3f9109df5a73f0058b093fcb348f3a7416aa372
font_01_sfnt_off000093fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FA 18520 bytes
SHA-256: 6cff786ebbe31f9ff1e85db23877156eec42a81d57e6ef62a0bd533977c3ab7f

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