Malicious PDF — malware analysis report

Static analysis result for SHA-256 4684dc591b2eb333…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 13:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e65328180922d565672534085fb314a SHA-1: c9fdef0b337345b569c9e66645b360e23be6613e SHA-256: 4684dc591b2eb333ba75feeadba5d571b18f9c65f6a3420926e37b56147308fe
160 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The primary URL, http://netcdn.tw/app/431946152/free-robux-apk-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains similar URLs and references to game hacks, reinforcing the lure. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-apk-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-pics_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hack-get-unlimited-robux-november-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/robux-hack-no-survey-no-download-easy_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-cbro-free-cases_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/granny-roblox-free-money-pro-hacks_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/robux-hack-no-human-verify-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pastebin-free-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-bis_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/esp-hack-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-boombox-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-promo-codes-october-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pokemon-go-free-apk-download_GM1094591345.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/toolbox-mod_GM479516143.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_off00002ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9 21672 bytes
SHA-256: b5b4b76382e58ee31f32b267cbefe90a1278501d0054c25e293d10d94862d9fe
font_01_sfnt_off00005dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFD 19064 bytes
SHA-256: e83e6ec4c124ed2d7ca7106d3550dd0cc1129fb3ff046dea9d423b5a0bd21ead

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