Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7a7a2d849f6a54…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 04:56:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac22438e63166eb183b950ff001c4947 SHA-1: f14906c94306984042246206bb9ad42a53a26c39 SHA-256: 3d7a7a2d849f6a5410fa198ad4d71f9b1fedfcc4831fab60ed9859d5406c5aa9
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 0.9980

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-daily-spin-link-game-hack PDF link annotation
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/roblox-ore-tycoon-2-what-does-cheat-research-do_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-long-should-the-account-stealing-hack-on-roblox-last_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/how-do-you-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4pessel.sch.id/__statics/gudangsoal/files/get-roblox-for-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
stream_002_off00003088.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3088 22444 bytes
SHA-256: a9187ba78475ec2edaae0ca920f9b7985258537ce5ee495d7e7abf46c248a2dc
font_01_sfnt_off00006271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 18600 bytes
SHA-256: a27276a21c997510c8d2741f1e08c7d679e7dab820b7a459a2ffd9e9d28be08b

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