Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdd189b2489f878…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 20:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4db65550483a6f0c6b07cc2c265f73d5 SHA-1: b1b11362116f948a9874e4d50480a197f6288ab6 SHA-256: acdd189b2489f878b9dd8a4722e6c20a2eb533b6ecd974ee584752309751c6ca
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/earn-roblox-game-hack PDF link annotation
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-coins_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://www.elearning2020.mtsn1kotaserang.sch.id/__statics/gudangsoal/files/free-minecraft-account-generator_GM479516143.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C37 26172 bytes
SHA-256: ddcf93cd0d98fd6a0ab10f54b133eeeeb7d3efae9f05cddde9c2af3bf9c43208
font_01_sfnt_off000088a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A7 18012 bytes
SHA-256: 93bf5a204a867a3cc71fe61d8ba690d7c5ca8a3d58d56ec60b4692a28d6ed968

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