Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d6d0f448804a1e…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 14:02:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ea4ab446d8af3a5662d921c4dc854c2b SHA-1: a9a1aa653b1ec2671156241017870620cab20102 SHA-256: 15d6d0f448804a1e99f63afdc6e2915ae0fafebc5876a4033a807b82a9cb377b
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 0.9980

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.tw/app/431946152/earn-free-robux-for-roblox-game-hack PDF link annotation
    • http://smpn1sda.sch.id/slims/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/phlego-films-roblox-free-bsdge_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-meep-city-money-hack_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-roblox-btools-hack_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/los-mejores-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-hack-for-ipad_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-roblox-sword_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-noot-noot-hack-roblox-id_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-hourly-giveaway_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-hack-coin-master-ios-2021_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_002_off00002f85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F85 22852 bytes
SHA-256: 26a31eafc971a0a1b15978e6fee2df4805793f3647ddf1e17999670bb5d8006c
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 18788 bytes
SHA-256: 098180cd614d2624df7268bdc42eb390b3940660e3b4a5d90fd1bd8a19720ac8

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