Malicious PDF — malware analysis report

Static analysis result for SHA-256 f555d605f2fda2e8…

MALICIOUS

PDF

51.6 KB Created: 2021-06-04 03:19:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 10b812aee2ffc24d3ab23121df6c8328 SHA-1: 9e97395bc5da79243a81d6ca50a0e77c7b6806c4 SHA-256: f555d605f2fda2e845eb6dde30b7189789de744780361dfaf5a0cceace86b9bc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with themes related to game hacks and free generators. The document body, though heavily obfuscated, contains references to 'Roblox Bloxburg Hack' and a URL associated with malicious activity. The presence of numerous external PDF links further suggests a link farm or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/roblox-bloxburg-hack-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/login-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005157.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5157 27076 bytes
SHA-256: 522d0a2fe1f781d029af1fb2c5ed464f686f1e8f831cf98ea9f025afe7c079b8
font_01_sfnt_off00008f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off000098cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98CB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DD 18612 bytes
SHA-256: 37e90c8061a4a16b527b0ce3c54248cb15785eeeb08769655426872893a017f2

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