Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec45fc1743a5cc3…

MALICIOUS

PDF

43.9 KB Created: 2021-05-10 18:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b892db01e66046481e66d9fe24ace646 SHA-1: d64111e49df13ab73eeb308738d767cdcad83ead SHA-256: 2ec45fc1743a5cc39f834b2fbc819b485ee9b6df3da8884409f9582bb39c70f6
240 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, masquerading as a 'free Robux' generator. It also impersonates Microsoft, a common tactic for credential phishing. The document's structure and embedded links suggest it's designed to trick users into visiting malicious sites, likely for credential harvesting or to download further malware. No scripts were extracted from this sample, but the presence of malicious links and social engineering lures strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-no-verification-game-hack.
  • 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.xyz/app/431946152/free-robux-no-verification-game-hack In PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/woman-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/earn-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnmodelpalopo.sch.id/__statics/gudangsoal/files/code-free-robux_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_003_off00004c75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C75 26288 bytes
SHA-256: 4b0224fb85d12c284133cb37a6637579d6fbc2ccbf81887d59c1c8a760759dea
font_01_sfnt_off00008856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8856 18600 bytes
SHA-256: 361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051

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