Malicious PDF — malware analysis report

Static analysis result for SHA-256 f658a5115554c476…

MALICIOUS

PDF

44.2 KB Created: 2021-05-13 18:53:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 144512ab84d5387ea90c21d22ced5fea SHA-1: 291f943590d4b53c593c66b3535b9cfb09eaa8b1 SHA-256: f658a5115554c4761a3c73d57616c563421f1095561ddab29373593841bcbcfb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a lure, employing 'game hack' and 'free generator' themes to entice users into clicking embedded links. The primary link leads to a redirector, and the document contains a large number of external links pointing to other PDFs hosted on a link farm. This suggests a phishing or scam campaign aimed at driving traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/a-lot-of-robux-game-hack PDF link annotation
    • http://www.jsvillas.com.tw/assets/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/generator-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-survey_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-for-today_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_003_off00004742.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4742 25104 bytes
SHA-256: 340cffcd87915bee5ea0e07c4a09a9b269d37ab4e117172ba321531dba73f164
font_01_sfnt_off00008129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 17952 bytes
SHA-256: 59ace597cf85b15723adf2883f87d3990bd92e723e57ffb30000155e26dd48af