Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a56ad543ed5ef…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 16:59:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 77a0d1737bc800bd6939b2053a6ef6f6 SHA-1: 4b9f9d35650a1db6579f747f463f7fa320d83aa8 SHA-256: fb2a56ad543ed5efa759a8af38e1dd2dfab1dd449aa5bea1eaecb45d43793673
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of 'game hacks' and 'free generators' to entice users into clicking malicious links. The document contains numerous links to redirectors and link farms, including http://netcdn.tw/app/431946152/grab-points-login-game-hack, which is identified as malicious infrastructure. The presence of multiple PDF links suggests a link farm designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/grab-points-login-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-pants-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-para-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-neon-blue-tie-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-you-make-free-pants-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-builders-club-code-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/team-chqnger-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-roblox-2021-youtube_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-october-28-2021-coin-master_GM406889139.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_off00003147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3147 22444 bytes
SHA-256: 3965bb111ecb7ad4c0611ddc4a1d069aa19145a968679a49fb36ddeecf63ccdb
font_01_sfnt_off0000630c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630C 18580 bytes
SHA-256: 2c24762620d9d623288236fe8aa88065cccc78c6fb64bc2c26f1a488593870f7

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