Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88fbc44cfc1fcb…

MALICIOUS

PDF

37.2 KB Created: 2021-05-20 13:39:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7950d223c0163ed3960201b68771e4f0 SHA-1: e221071455098646ba1e8f2cd5d3032765c7092c SHA-256: de88fbc44cfc1fcb0084d511b9728588c33a7a1cbaf695c5becc2c506931291f
200 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to a malicious domain, masquerading as a "free generator / game hack" and impersonating the PayPal brand. This lure is designed to trick users into clicking the link, which is associated with known malicious redirector infrastructure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to facilitate credential phishing or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/431946152/free-robux-pastebin-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
  • 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/431946152/free-robux-pastebin-game-hack In PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.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_off000033f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F5 25404 bytes
SHA-256: 203230707af5f8fc276c4d702ec3ad8592d8dfe106840b6b64aaeef3bed93d7e
font_01_sfnt_off00006efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFB 18620 bytes
SHA-256: 10493b23bc5ef0d73c1582ce0af85c313c8077c60a374ecda70c4edbf5cadd5c

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