Malicious PDF — malware analysis report

Static analysis result for SHA-256 353163362ce2f618…

MALICIOUS

PDF

48.0 KB Created: 2021-05-19 08:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 447d8b07b073533fb177f6e7dfa0f20f SHA-1: 68a165ec2368619e7ae92559ceadad39e0755765 SHA-256: 353163362ce2f618ad08d958997b628d0e0eaa54e36d9f7a1976c5131b643e72
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • 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.
  • 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
  • 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/431946152/free-robux-websites-that-actually-work-2021-game-hack PDF link annotation
    • http://maestriadental.com/images/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/woman-roblox_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-15-free-spin-link-of-last-5-days_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_off00004b52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B52 25644 bytes
SHA-256: 3f49728c395482063733cfbda37913a9624bd93d4dfe87abd8291e5867bcf235
font_01_sfnt_off00008666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off000094f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F2 19656 bytes
SHA-256: 7b3ca8e33f6ab65cae0b12a773bae5d0e0377a7b1030ef9ec14be3c3cdd71d54

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