Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9896d7e42d0374e…

MALICIOUS

PDF

33.9 KB Created: 2021-07-01 04:37:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 21b4c143b82df33ee48f08dc4cea143f SHA-1: d4b094afd41fc33bd8bd4767ebd1e61c2c76e7f2 SHA-256: d9896d7e42d0374e7388e7a3305a109071e370d94eba277f54e327ebf906a336
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, such as http://netcdn.co/app/431946152/how-to-get-free-admin-on-any-roblox-game-2021-game-hack, which are designed to lead users to potentially harmful content. The ML classifier strongly indicated maliciousness, supporting the observed redirection and link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.co/app/431946152/how-to-get-free-admin-on-any-roblox-game-2021-game-hack In PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-hack-generator-no-app-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/1-million-robux-for-free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-generator-no-verification-pc_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/pastebin-roblox-promo-code-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/hacking-egg-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/welcome-to-farmtown-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-robux-robux-robux-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/como-ser-hacker-en-roblox-con-usb_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0C 22632 bytes
SHA-256: bb3ec6e06694dcd23ec42c065790581636569e73a768bae1f8e9fee497bfd51a
font_01_sfnt_off00005cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD4 20052 bytes
SHA-256: 56e47953d2ca407e1a4cb7063d09dea333fd308caad8d32caed6fb3334ed4385

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