Malicious PDF — malware analysis report

Static analysis result for SHA-256 f578d62ead43fedb…

MALICIOUS

PDF

48.7 KB Created: 2021-06-04 00:26:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a7f43fe7ed0819c9a8c8c6d236f4528 SHA-1: 91a1e9c5bd962785cc617c3f73558a1d82f5d857 SHA-256: f578d62ead43fedb05db67dc9ce67581aa38a21bc9a8122ec8b0abf05c4d9a03
220 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users with promises of free game currency or hacks, redirecting to known malicious infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary goal is to drive traffic to potentially harmful sites. While no scripts were directly extracted, the nature of the lures and the embedded links strongly suggest an attempt to exploit user interest for malicious purposes, likely leading to further compromise.

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.online/app/431946152/free-robux-without-human-verification-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/mc-update_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/what-do-points-do-in-roblox_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_004_off000052d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D6 26488 bytes
SHA-256: d7fdce7c7e503a7d6c690c6f603637618ca189e08954e97e1bdbe2e2dd87bde3
font_01_sfnt_off00008f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off000098cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98CC 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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