Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb90e41e924eb3c…

MALICIOUS

PDF

50.1 KB Created: 2021-06-04 00:56:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0acdc700e11f196372f253e4482ddd49 SHA-1: 7931e1aa26e076148252aaaee4def3d0f66d4584 SHA-256: 3eb90e41e924eb3c703e9397e2937e23bec39f12ff1891ad082a1da34c84fcfa
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF contains multiple links designed to lure users with promises of free game currency or hacks, ultimately redirecting to a malicious domain. This domain impersonates a brand (Apple) and hosts a credential phishing page. The ML classifier strongly indicates maliciousness, and the presence of numerous SEO-optimized PDF links suggests a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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.
  • 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.
  • 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.online/app/431946152/how-to-get-free-robux-no-human-verification-2021-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.online/app/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B1 29568 bytes
SHA-256: f7f450074f42a929180ed5df9be209a2dc71dff17d8652177174c5eacd6b1f57
font_01_sfnt_off00009421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9421 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00009dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD2 19428 bytes
SHA-256: dc7c459a90b1a398d2ee51f52972ed8a07904c77cd045887558a99bdb9823e3c