Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39d76f085891835…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 01:57:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 55757a872246cad144d73744f02c325d SHA-1: 14397780f4a22bff2e5f66c5ef5edb0cd0487d00 SHA-256: d39d76f08589183596341f11c6e09e9c2459a12a9d956b69398946e6e105b770
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting free game generators and hacks. The document body, though partially garbled, contains text related to these lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/479516143/minecraft-that-you-can-play-for-free-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off000051b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B6 25764 bytes
SHA-256: 2288660e0e4d1f739ff6e3dedd05f088904e16071054134c7bbd2ce0960efe9c
font_01_sfnt_off00008bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 2892 bytes
SHA-256: e0a0e7499c3dd10c5114bd1538d6e258e6cb3acdd4f79d9538668087a4bdd2cc
font_02_sfnt_off000095a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A1 18588 bytes
SHA-256: c2b8d9ff41b5817f39fe12fa9914c2498059949854f0a019c9b111e2507a5aed

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