Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa710a589cfb5b…

MALICIOUS

PDF

39.1 KB Created: 2021-05-19 03:05:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0251b404bbe390e6b55facc83081eb0d SHA-1: 6b2b0ff5d0b8d9f547f574a0c5b829a3fb67d434 SHA-256: a9fa710a589cfb5b3073fd7326ae57788faa619f513087b5e55e437a861c5eab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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/1330123889/pubg-uc-gift-card-game-hack PDF link annotation
    • https://www.arquetopia.org/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.arquetopia.org/images/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/pokemon-go-free-10km-egg_GM1094591345.pdfIn PDF document text
    • https://www.arquetopia.org/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.arquetopia.org/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.arquetopia.org/images/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.arquetopia.org/images/100-free-spins-coin-master_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_off00004843.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4843 26872 bytes
SHA-256: ceb4b6ca8eb736a6b7c6a4309d219c7e7462505a1e629ea3a85adacba2ca4f7d
font_01_sfnt_off00008377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 2816 bytes
SHA-256: 214f0b8c2b3c279476f862ae08d7e072944da5f6084cbd6130f0ffdc3460b614

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