Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e8dfab0c5d322c…

MALICIOUS

PDF

41.2 KB Created: 2021-05-14 09:10:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f2cc4633dd2adbcb8cfc0eade5da107 SHA-1: 0be625eef6cca4e77a66c6f7381c8f259923b136 SHA-256: 85e8dfab0c5d322cf11dc29527015ccb451fe0bf97cf00b13854598fdc88ae49
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, including a known malicious redirector. The document body and embedded links suggest a scam related to game hacks and free in-game currency. The presence of multiple links to external PDFs indicates a link farm strategy, likely to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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.xyz/app/406889139/coin-master-games-hack-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/freerobux-co_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-do-i-get-free-spins-on-coin-master_GM406889139.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_003_off000048db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DB 24156 bytes
SHA-256: 28f9fc6dd9e224d060763b24ba7bea9cd3eee18b2de66692438f194544cabe6c
font_01_sfnt_off00007f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6B 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14