Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5968c7130d3bc9…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 07:53:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 394207ab223099e1c96da64058f2739a SHA-1: 9528799a9bf62c344fd44798c3ac2bcb2d510090 SHA-256: 1f5968c7130d3bc98d592f466882ce250c961036825babdd16f8b3f90c865d02
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free Robux and game hacks to redirect users to malicious websites. The document contains numerous links to external PDFs, many of which are likely part of a link farm designed to improve search engine rankings for scam-related keywords. The primary redirector URL is http://netcdn.co/app/431946152/free-robux-app-computer-game-hack, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to exploit user interest in free in-game currency and hacks, leading them to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-app-computer-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-money-in-roblox-for-free-ipad_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/como-instalar-hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pokemon-go-free-yamask_GM1094591345.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-dumb-brothers-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/is-coin-master-hack-safe_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
font_00_sfnt_off00003268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3268 22568 bytes
SHA-256: 550269296684d116e1eaef0ecbb498d0fb22562eef53da821adba3ee98539969
font_01_sfnt_off000064d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 19256 bytes
SHA-256: ed82a257d25670013d5e2b52f613cd766f0fa92e7fbde261611bb631c98cbfb6

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