Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf3c2eab9b8eedf…

MALICIOUS

PDF

38.5 KB Created: 2021-07-04 12:44:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3a0edc5c7e6920859a781f4ff437eec SHA-1: 14d5bce531daaa620539601b33acd2256267f996 SHA-256: 2cf3c2eab9b8eedff5dc862d8f7dee620d3c6253ad6dda550787ab24b0bc7a6a
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 0.9985

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 http://netcdn.tw/app/406889139/coin-master-connection-lost-game-hack PDF link annotation
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/roblox-abs-shirt-free_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/roblox-legendof-the-fallen-kingdom-2-rpg-cheats_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-get-25-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/roblox-catalog-free-stuff-hack_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/get-free-robux-from-watching-ads_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-apocalypse-rising-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1kotaprobolinggo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-realms-for-free_GM479516143.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_002_off00003e2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E2F 24168 bytes
SHA-256: 227051e22c4446ff7509dd1a2659c6e0ceeb3f83d2426e52793fdfb65e01d0c0
font_01_sfnt_off00007550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7550 17836 bytes
SHA-256: a76b435a66663bc960d26f3f6b43f7089cbbf554bd18db08d117cbb299e70e3d

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