Malicious PDF — malware analysis report

Static analysis result for SHA-256 072e23739b92560b…

MALICIOUS

PDF

44.4 KB Created: 2021-06-14 00:21:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a2e88854304cf28e99118ecb0e8135f SHA-1: af7fe6b717fda4e27331f51954a4091ae677ca30 SHA-256: 072e23739b92560b257b36d2512545b41b43c8566cee8f336d8482c73d019e0d
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 0.9632

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 http://netcdn.co/app/431946152/comment-cheat-sur-roblox-retail-tycoon-game-hack PDF link annotation
    • http://ff-klaffenbach.de/images/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-cheats-dragon-ball-final-stand_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-codes-mobile_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/simple-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-accessories-roblox_GM431946152.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_off0000469e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x469E 24560 bytes
SHA-256: f61b230c09d88ec92e662657d7957c2f219c4d4ff6011cb98f6918743ae8e768
font_01_sfnt_off00007ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF1 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000088ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EE 18980 bytes
SHA-256: ddae880e845ea20ffa5ce645fc05f5f1fb423a671b769d4175b17311dddfeb28

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