Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8b9c9d39fc57e3…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 19:06:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e2789afb25fdb44b36395fc867ed516 SHA-1: 09c1d7412d402830a7276370ba6ec237a9027975 SHA-256: 1b8b9c9d39fc57e3f337ae0eb67d9f5536b7b2bb2d4898424fb9fd25ea88f759
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a lure for free game currency or hacks, which is a common social engineering tactic. It embeds a link to a known malicious redirector, http://netcdn.tw/app/406889139/free-spin-and-coin-game-hack, which likely leads to further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/free-spin-and-coin-game-hack In PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-playing-a-game_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-for-ads_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/10-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-use-redeemed-cards-on-roblox-no-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/cheat-tower-battle-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/cheat-roblox-fr_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-see-through-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-on-xbox-one-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/cheats-for-roblox-jailbreak-money_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/get-roblox-items-free-chrome-addon_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-greenlegocats123_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/pubg-uc-trick_GM1330123889.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/gift-cards-free-roblox-march-2021_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
font_00_sfnt_off000030e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E3 23856 bytes
SHA-256: 9203f63fb1ef4bee6944ce684c451941bb66413bd269644a9b6f8d96481f7897
font_01_sfnt_off0000667a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 18244 bytes
SHA-256: 1760058a9b4ac65e75107fdb05ced4e329212cd08f375451f5a371d24b39a496