Malicious PDF — malware analysis report

Static analysis result for SHA-256 81027ab6f1c5e72d…

MALICIOUS

PDF

48.0 KB Created: 2021-05-13 21:05:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 242005297322f4e60b6ab9170a25447d SHA-1: 55301ee4c314fb4e4a3abbf381dab2620eea896e SHA-256: 81027ab6f1c5e72db831ea8ade2e0cad56eac5d53fd019e6b47d088bf41b5d48
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering game hacks, indicating a lure for users to click through. The heuristic firings confirm the presence of malicious redirector links and a lure for secret recovery, suggesting a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • 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-character-free-game-hack In PDF document text
    • http://huounaixunghe.com/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9C 28852 bytes
SHA-256: 0d9984339bfabd7845a32d9cd43002329da619b6b4b1de157958d01f29c44874
font_01_sfnt_off00008bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDD 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000098ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98EF 18448 bytes
SHA-256: 05a96a9ae39645995e15b2d168b0f8c4367af40f40b0e0a665e781c288f1fec7

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