Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1b7a2f470c9d65…

MALICIOUS

PDF

44.1 KB Created: 2021-06-11 05:34:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 411a7280d1368168bf5a27f1d8fdabed SHA-1: 1c462871ef5c0bca9402323dc3b9717e62736722 SHA-256: ff1b7a2f470c9d655a9bf957be5458eea7bf20e37386da06828d9a91a6928324
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains embedded links that impersonate Facebook and lure users to a malicious redirector disguised as a game hack generator. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links suggests a phishing or credential harvesting attempt. No scripts were extracted, but the document structure and embedded URLs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/all-black-roblox-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
  • 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.tw/app/431946152/all-black-roblox-free-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/pokemon-go-free-mew_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pubg-300-uc-price-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-gift-robux-on-mobile_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_004_off00005282.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5282 24124 bytes
SHA-256: c73c1894a73cec68bfcfbc695df6559f7ef3f2643955ce77d38cf198f89db3b6
font_01_sfnt_off00008984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8984 18344 bytes
SHA-256: 052a843cf5c4a9636714992cdb82a9b749a126e794624661c5c7997f954c121e

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