Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca13b7ae510ff2…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 15:14:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 97a16af72bd9f40b5bb564ee0f219e63 SHA-1: 7c3db3f3ff864829b87c4fec1b3cc76c94794fd9 SHA-256: cbca13b7ae510ff20b71946f1b4283d1e6fa6b89e32b6eeea10513e81cde2de8
260 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body and extracted URLs suggest a scam related to game hacks or free currency, designed to trick users into clicking malicious links. No scripts were extracted, but the overall pattern points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-400-robux-free-2021-game-hack In PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/how-to-get-free-1-million-robux-new_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/noclip-hack-download-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-online-free-spin_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
stream_004_off000055dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55DC 27152 bytes
SHA-256: 1e9917138806ba878c158a90576f1987ec29649d9499d384be8c1ceeb2c02aec
font_01_sfnt_off00009425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9425 18744 bytes
SHA-256: 4cd8c7d3bbe5d3c304a53130d9d04443b59b38b782d96c9b0be7ffe64a2e55ac

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