Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b5776f9815303…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 10:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fef0fb237ccc5226907b432b0201953a SHA-1: 57488f6c0dd6833deed91181fe3e6180f147f496 SHA-256: fa2b5776f9815303a0c90cd9922cebb467a7c1bdd85a91ee8c2462a0ed20bb82
200 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/free-roblox-shirt-templates-game-hack, which impersonates Facebook to lure users. The document body also contains a call to action to 'CLICK HERE TO ACCESS ROBUX', suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the lures strongly indicate an attempt to trick users into visiting malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.tw/app/431946152/free-roblox-shirt-templates-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 http://netcdn.tw/app/431946152/free-roblox-shirt-templates-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-online-games-no-download-like-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pubg-uc-ykleme-kod_GM1330123889.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-roblox-no-chash_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/8-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cheat-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/link-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-and-obc_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-online-no-human-verification_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
font_00_sfnt_off0000306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306B 23024 bytes
SHA-256: 47866392e3c1dffddd34051b5ee2323605f77b97cb02b590ea698d7f298c0c82
font_01_sfnt_off000063f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 19476 bytes
SHA-256: d4dda0947c8e17980e88e1462510a52d759f4b560e466f6bfd07fe68f5c817f5

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