Malicious PDF — malware analysis report

Static analysis result for SHA-256 312a9961062d6a14…

MALICIOUS

PDF

43.9 KB Created: 2021-05-15 14:08:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9ebd0f24fefde9ade0a00c31e048fb26 SHA-1: 453e6f9fabe3e5365d76948e2086b9ff777fcfe1 SHA-256: 312a9961062d6a14ffa1143a1eb57264c2e246b7b5c8897cc6da2d37ad8a46ff
280 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector, and is designed to lure users with promises of game hacks and account recovery. The heuristic firings indicate a critical risk due to the malicious redirector and the lure for secret recovery, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the document structure and embedded links strongly suggest a malicious intent to exploit user curiosity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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.
  • 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.xyz/app/431946152/roblox-hacking-website-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-heaven-free-spins-today_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_003_off00004873.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4873 26712 bytes
SHA-256: 3a9e848be3e28c4552f63b81369e57e89b6bd4d2d2c4dfccf4bc210c6fa57eac
font_01_sfnt_off00008778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8778 18892 bytes
SHA-256: e7d47ce6402ad6c34a9dd837b4455ddf5104770abd157e72eb2d384f2e13ef46

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