Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b01ce973ac38120…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 19:10:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2ade081d847f7f6c1238b18cd9923b2 SHA-1: eee8b8b1e827629fdfbb1918f502ed0fcf641327 SHA-256: 5b01ce973ac38120c370c429acfc8137644cfe51ee6aa4d7a00ccef5bd420d46
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and a large number of links to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary lure is related to 'free Robux' and game hacks, aiming to trick users into clicking through to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

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.tw/app/431946152/how-to-get-free-robux-on-mobile-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/unused-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-save-a-free-model-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-human-verification-or-survey-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_off000030f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F0 22220 bytes
SHA-256: 104081a95f6ce78fc3040e5d63dddaefbe4822645b129237bd3f3adfd53a2e77
font_01_sfnt_off00006216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 19372 bytes
SHA-256: 5331e3b47e1eecd1b1cb57ee2f3545b8b8fbb1b10f6e158321778d87dfa25569

Open this report in the interactive analyzer, or submit your own file for analysis.