Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff2e86f2da89333…

MALICIOUS

PDF

48.4 KB Created: 2021-06-08 18:17:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: de523c2b78e737b69923c7cc4aab362d SHA-1: 0c29beed1a60410f033a35013d2ca31617a37bef SHA-256: fff2e86f2da893336523f119440131f79f340a369cdce4fbabbd43010ecabb08
220 Risk Score

Malware Insights

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

This PDF document contains multiple links designed to lure users into clicking on what appear to be game hacks or free generators. The primary link, 'https://netcdn.tw/app/431946152/cheat-power-simulator-roblox-game-hack', redirects to known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of a download button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/cheat-power-simulator-roblox-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/tiktok-free-upload_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hack-robux-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • https://www.roblox.comIn 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_004_off00005218.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5218 26104 bytes
SHA-256: 067e02ead8d4b4d6eb2b671a482e14a669a800aa8d2fae5a91326cabaf2085d8
font_01_sfnt_off00008dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFD 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000097e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 19120 bytes
SHA-256: d5a871c5eb8f009eb1b072a70ee5ec6a1b42c055c56b4eca18dff90643077d0e

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