Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a348b132de7b8fc…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 16:52:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9eb746ccce2b4e564424f1f1e080f629 SHA-1: bc2b3d276d66bc98046caeef75201dd7d31bf204 SHA-256: 7a348b132de7b8fc1f5c00fd54387dc78fe61ea5b4c74f8a36c37ec2e844dd93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary link identified is http://netcdn.tw/app/406889139/free-spins-for-coin-master-game-hack. This suggests a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/free-spins-for-coin-master-game-hack In PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/my-roblox-account-got-hacked-flamingo_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/download-free-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/giveaway-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/roblox-cheat-engine-tables_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/robux-spin-wheel-free_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
font_00_sfnt_off0000308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308C 22436 bytes
SHA-256: b95373219d208194db282c22cddb37b5004c8c018acd6ae3ee85158f7bd43303
font_01_sfnt_off00006292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 18176 bytes
SHA-256: 0b37b87f907bc50fa1e450587a0e1f43116f92b011bc5b47444974eee354eb2f

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