Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2542870e797ff6…

MALICIOUS

PDF

50.6 KB Created: 2021-06-11 06:09:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 93233b564a5637e97d2ed74577deab6c SHA-1: 017eeb35945fe41bab954c16073f6b70f3254886 SHA-256: 1a2542870e797ff6779a166464201131a02c2b61ff6bb1696f7ed3e31b90a553
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary URL identified, https://netcdn.tw/app/431946152/free-download-roblox-unlimited-robux-game-hack, is associated with a known malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and download prompts, reinforcing the lure. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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 https://netcdn.tw/app/431946152/free-download-roblox-unlimited-robux-game-hack In PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/get-free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-robux-not-fake-2021_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/easiest-ways-to-make-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-robux-hack-mobile_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/pubg-uc-kr_GM1330123889.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_off000053fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53FB 28612 bytes
SHA-256: 475f2dd622758581d228c982e5d8090177ec1e1eb45c76f4fbaee0a97019655c
font_01_sfnt_off000095bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BB 2896 bytes
SHA-256: 0f10adbf105d053971010bc1f17c4dd55814d599674c84f75a6eb4cb46a9c89b
font_02_sfnt_off00009fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB2 19492 bytes
SHA-256: 5f2feb692a8dfaed2e06948e26c139c8dedda601d51e79a89036a923db1a00cd

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