Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb89b2bc099f4b1b…

MALICIOUS

PDF

47.0 KB Created: 2021-06-07 14:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 42c15743e46c9ef38787373824d26b12 SHA-1: 289713e949646aebd560d428feeb6d8c847e33b2 SHA-256: eb89b2bc099f4b1b364cda2f4611076466f8095810f577c0b7a9c5f95736ca04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a "free generator / game hack" lure. The document body and embedded links strongly suggest a phishing or scam attempt, aiming to trick users into visiting the malicious URL. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to further obfuscate the redirection or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-robux-no-vertification-no-survey-no-pasword-game-hack In PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/sword-fighting-tournament-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-do-you-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/pokemon-go-free-or-gotcha_GM1094591345.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/pubg-uc-carding-quora_GM1330123889.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://stikgiamakassar.ac.id/digilib/repository/free-coins-and-spins_GM406889139.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
stream_004_off000051f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F9 27616 bytes
SHA-256: 729f40ef1a9e8b00c412fa253b8de28c074f010e8936fdf812cc67a89063f19a
font_01_sfnt_off000091bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91BD 19388 bytes
SHA-256: 02e60e9ce4311a69f97ea180622cb4d4d423e977c5a47c6d403a6a4d9c304346

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