Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2cbc1e62a919a6…

MALICIOUS

PDF

48.4 KB Created: 2021-05-20 01:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e6cf0b547975a48def337d49c5a7fb40 SHA-1: 554200f5c11722a243e28f603064848c9e3d53b7 SHA-256: 0b2cbc1e62a919a6ac0007434948081d4cee873d3ac107c8a30dced33c1e80f6
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are designed as link farms for game-related hacks and cheats. The primary URL, 'https://netcdn.xyz/app/431946152/hack-robux-game-hack', is directly associated with a lure for game hacks. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were explicitly extracted, the structure and content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hack-robux-game-hack PDF link annotation
    • https://cbiinc.org/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://cbiinc.org/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://cbiinc.org/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/robux-game-com_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://cbiinc.org/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cbiinc.org/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • https://cbiinc.org/images/how-to-get-free-gamepasses-on-roblox_GM431946152.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_003_off00004702.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4702 26036 bytes
SHA-256: ea45029aaecae79979c6313889669900aaf85ea2b2cd1e71dfcb457d2f0829d2
font_01_sfnt_off000083b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B0 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6E 18248 bytes
SHA-256: 9805bb7d0eadd4beaac6fd3b5d5d8b6e8e5d33c97ce909732e364f826719e5d2

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