Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b753ecd5f2d84…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 12:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ab2216256f75370b88f91841ad871aa7 SHA-1: 83d116825fe26badecee3bd46f02c4675562e4ff SHA-256: 627b753ecd5f2d84a615b14df551a9e7fbf55f0746562a71528664384cd884d9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to websites that promise game hacks and free in-game currency, such as 'how-to-hack-roblox-to-get-free-robux'. This indicates a lure-based attack pattern designed to redirect users to potentially malicious sites or scams. The presence of a large number of external links, many with SEO-like slugs, suggests a link farm or content spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/how-to-hack-roblox-to-get-free-robux-game-hack PDF link annotation
    • http://www.herbasacra.gr/images/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.herbasacra.gr/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://www.herbasacra.gr/images/coin-master-hack-xyz-download_GM406889139.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_003_off0000488b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488B 25068 bytes
SHA-256: e4cfc50461c39bbcd8d95ff7d68cd82a57b8f38ec675bef47cc5ebc04c517ec5
font_01_sfnt_off00008209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF3 18756 bytes
SHA-256: a768fd9037f2962d7d468f6b0310abba3890de72b41426d235b5de2790bab1ac

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