Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb8b4a4d70c0f85…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 08:12:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 59778d1ccff006e799981047863ac5f8 SHA-1: a9f4a53320aaa8f5031fbfd931a2f0ba171110f2 SHA-256: efb8b4a4d70c0f85fa89eafb0383f8866701d7cd1c4816bbd26d6a657ed405ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with one specifically identified as a malicious redirector for a 'game hack' lure. The document body, though partially corrupted, contains references to 'Coin Master Free Spins' and 'Roblox', common themes in phishing and scam lures. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.
  • 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.online/app/406889139/coin-master-free-spins-link-download-ios-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-hax_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-card-codes_GM431946152.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_004_off000054f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54F0 25936 bytes
SHA-256: fa50557de43920d69acacecf757bf48282b84a421dfb5dc056a7854c0010c055
font_01_sfnt_off00008e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E59 3560 bytes
SHA-256: 9d03f7c6c62ba3e7fdc0441e9d982a863b2b60b781165d6920512f68ecc4a440
font_02_sfnt_off00009ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE0 18636 bytes
SHA-256: e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46

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