Malicious PDF — malware analysis report

Static analysis result for SHA-256 91acd4b2d782a3f5…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 02:22:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54e8e66017f72b018cf153111e745e68 SHA-1: 50dbc73e1a246d573044ca0188c6ba69c28519c8 SHA-256: 91acd4b2d782a3f55e387deb08061b78323cfbc0cacf5d80204c3bae9e21410d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm, promising game hacks and free currency. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to solicit sensitive information like private keys or passwords. The presence of multiple external links suggests a phishing or scamming attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-spins-on-coin-master-links-2021-game-hack PDF link annotation
    • https://www.elevage-chiot.fr/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.elevage-chiot.fr/images/como-generar-coin-master-free-spins_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_off0000486e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x486E 25020 bytes
SHA-256: ba5266a63ab528d7d8b64c8e01295b64a9e5c9d10dc0a4d2e586eb25a3eeac75
font_01_sfnt_off0000803e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803E 18456 bytes
SHA-256: 7b1155f871a560b207ad2828617dae8a6faf2a903bcd289e8190a508e5d9fe16

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