Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5b29ae4b054975…

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 02:42:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5df80ec55b266ebc4e8e6426aa127086 SHA-1: 6a01eccc038774e297b0b76697cb83b303dc873e SHA-256: da5b29ae4b054975d53dda7863d99ab9e7f766d6a7285ebd583b8d2d082059d0
300 Risk Score

Malware Insights

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

This PDF document contains multiple links to game hack generators and known malicious redirectors, indicating a phishing or scam attempt. The document body and heuristics suggest a lure for free items or game exploits, which is a common tactic to trick users into revealing sensitive information or downloading further malware. The request for recovery secrets further elevates the risk, suggesting an attempt to steal credentials or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://netcdn.tw/app/431946152/roblox-how-to-get-free-clothes-2021-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-for-coin-master-app_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_off000052d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D0 27816 bytes
SHA-256: b3aad1f589a5ef8ed9aeca9d7dd3e1e714a72152b7a8453f65f773ba378fade9
font_01_sfnt_off000090dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DD 18784 bytes
SHA-256: b724e7fceb4cf2a5909ad66e3ae3fb5cfb1506f9dcfb309604abd0fdb1e7dc55

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