Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f00afc1e1e03bbb…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 13:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e5de1fbdeaa4d24e42ff519a7222626e SHA-1: 4f6264400a1ced21870462a5d639b1996d9e4cb7 SHA-256: 4f00afc1e1e03bbb51198ee5ece4290458eca5308199436d91117efbe81abf17
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed to lure users with promises of game hacks or free currency. The document body and embedded links point to a URL that serves as a gateway to potentially harmful content. While no scripts were extracted, the PDF structure and linked URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-get-free-robux-on-android-game-hack In PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/robux-hack-me_GM431946152.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_off0000538f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538F 25784 bytes
SHA-256: 1da639d25914fed9b6d61a3382c0f0283b0a887082cfc47c1e7d8f43ce5dc326
font_01_sfnt_off00009018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9018 3944 bytes
SHA-256: 3f3794bd7cd4a0c02dda89a5a948164ba1255e4c347e60cb76fd79520878af45
font_02_sfnt_off00009d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D02 18576 bytes
SHA-256: be12fe34256d848f1a7db569f7882c3333b0548de7731ecd127307da0fa566a6

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