Malicious PDF — malware analysis report

Static analysis result for SHA-256 0761df702d5056d2…

MALICIOUS

PDF

40.2 KB Created: 2021-05-20 21:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72b31ff9bf027676b7eef03ae77dcb19 SHA-1: 9c158c3b72f37d5c2e8f0dd40b360719f10bff11 SHA-256: 0761df702d5056d21550a023b62ab2f7a28ecb94012bcb4623393085c287b5e3
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file 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 0.8010

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/835599320/how-to-get-coins-on-tiktok-for-free-game-hack.
  • 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/835599320/how-to-get-coins-on-tiktok-for-free-game-hack PDF link annotation
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://bpkad.denpasarkota.go.id/new/public/ckfinder/userfiles/files/spin-coin-master-hack_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_002_off0000356e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x356E 27440 bytes
SHA-256: de9ed81f8c94290c2b4408b58969ae982f18825c0710edf565f42b10bbc3cb4f
font_01_sfnt_off000073d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D0 2840 bytes
SHA-256: 0ff7203f6678b3ce5cadf82d8d4ab75daf80d11355a5b436446d16072593a6f7
font_02_sfnt_off00007d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8B 17620 bytes
SHA-256: 8692d5e818e35dd748692bcd8ce3b5e7bd8db96413eb0bedc2b598b0f37696f0

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