Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cb758a52096ba2…

MALICIOUS

PDF

47.5 KB Created: 2021-06-13 17:27:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d5e511d219c8aa01d850072787a385e3 SHA-1: 6aca9ac50d677060afcdb52c679b2f79901a3486 SHA-256: 82cb758a52096ba2c511cebbfce38fb221e5fb8de45be599def82e159560e44a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to a malicious website, likely to deliver a second-stage payload. The document body and heuristics indicate a lure for game-related cheats, specifically 'Robux', to entice users to click the malicious links. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.
  • 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/robux-cheat-codes-2021-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/free-4k-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/wix-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-restaurant-tycoon-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-games-robux-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/redline-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-bucks-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/console-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/cheat-roblox-abeille_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/como-hackear-una-a-gente-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-dollar-chain-tshirt-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2D 24832 bytes
SHA-256: f0c061ef503d72801b5dc0ccec319c78677d7bc75fbb89f45ce942cf390f062e
font_01_sfnt_off00008829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000094d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D0 18924 bytes
SHA-256: 46f32cf2f45095e584f0532714a2262c398fcf7132be6044185c6d67f0d2aee4

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