Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1d9d2865abff65…

MALICIOUS

PDF

46.9 KB Created: 2021-05-18 00:34:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cf399e0a7b81d970423b4fb11e091fa8 SHA-1: f80d5aebcfecb8691e37a315f4dbcbc10e216c7c SHA-256: 1b1d9d2865abff658096e72cb38f2b532baddd961044122fcfa376b73ca0ae86
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, 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 0.8948

Heuristics 5

  • 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.
  • 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/today-free-spin-coin-master-game-hack PDF link annotation
    • http://per-bittner.de/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://per-bittner.de/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/fbchampion-com_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_off000049e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E7 28128 bytes
SHA-256: 493212a581da90c98a2b3731e7d366ce1b1ce67354aae3388d44560ccfb9830c
font_01_sfnt_off00008ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB0 2920 bytes
SHA-256: b1ee9e8e678bac517d0cfd3dddd9b89d95d96af50fb15ea3788eed97880a9717
font_02_sfnt_off000094cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94CC 18240 bytes
SHA-256: 1b392e4e99e418e4b3aafc08017bc674641ef7dd4d3aea32a3af237a513dd73c

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