Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc5b0f393ae86b7…

MALICIOUS

PDF

45.4 KB Created: 2021-06-14 02:05:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a84dbc662282637377510138b6a7dfa SHA-1: 1ea2c94abd2c6ee9bc874fb8314d2904f23aa5dc SHA-256: bfc5b0f393ae86b73d7a6347be3932967fda847ae0bbfd5d96c9fc3f99facd9a
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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 http://netcdn.co/app/431946152/free-vip-roblox-game-hack PDF link annotation
    • https://scraperite.com/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://scraperite.com/images/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://scraperite.com/images/trustworthy-free-roblox-lua-executor_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://scraperite.com/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://scraperite.com/images/roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/best-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://scraperite.com/images/roblox-hack-2021-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/legit-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/free-download-roblox-tshirt-guns_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/hack-indir-roblox_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/roblox-cheat-jailbeak-2021_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • https://scraperite.com/images/roblox-mining-roblox-hack-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://scraperite.com/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • https://scraperite.com/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • https://scraperite.com/images/how-to-hack-someones-account-on-roblox-vr3million_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_003_off00004ab4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB4 26336 bytes
SHA-256: aa359bbaccf59aa25d8a0edcaf58d6cbc8e0eb371d908f0126e6536361b5c928
font_01_sfnt_off000084e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E7 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E95 18380 bytes
SHA-256: 94d125d3dbde40cc9d5054aafe15a05973ae878bc41c5e9bff003f3b9c84471a

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