Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc14d8f06d157ad6…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 14:06:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c82c2efb7691ae347ab845a7613df09 SHA-1: 63c26a995d2de1b8af618f8f53a2f1ff5a930d5b SHA-256: fc14d8f06d157ad63ae110eb499b017e1490e2bcf2895ec19a581ee8ef569a4a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators or free currency sites. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The presence of a visual download button further supports the lure tactic. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam campaign.

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/406889139/haktuts-coin-master-free-spin-link-game-hack In PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-free-robux-easy-on-a-phone_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/black-clover-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-buy-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/roblox-mining-simolator-hack-script_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
stream_002_off000030bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BB 23384 bytes
SHA-256: 104e4f8d40d1660c4fbc7f783bf5a78724039dd821288792b0baa6f7947105d9
font_01_sfnt_off000065b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 18484 bytes
SHA-256: d9a037a653ed28116979e3af0bb76bb4d7eaba1060cd405c4d4ff8bdf95a3337

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