Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde56c28114e85f1…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 08:58:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5bc2873f25a0450241a0dda3dc4ed0b9 SHA-1: 6884ca19f01e710e9841368cddad1ef0a4614d43 SHA-256: dde56c28114e85f1291a2bc2ac7048c375f7d6b4ee2452800c40401c59cef1d7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a malicious domain, masquerading as a game hack or free currency generator. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and uses a lure for game-related content. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or scam attempt to redirect users to potentially malicious sites.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/get-free-robux-without-human-verification-game-hack In PDF document text
    • http://library.umla.ac.id//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/near-pubg-uc-code_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-atamations_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/get-free-spins-on-coin-master_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_off00003049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3049 22412 bytes
SHA-256: bec99e43e74fbaebc54599e7a8d8b1b9d38226b8f95063808184d7539893f5cf
font_01_sfnt_off00006289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 19700 bytes
SHA-256: e8bf7ca05401f798ebc0703cbcc09d220ccc7d22796280ca6a3dd60c700d0f91

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