Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ee261f2dcc08e8…

MALICIOUS

PDF

49.0 KB Created: 2021-06-11 00:27:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ea1223fee88069ff1f143ded3655866a SHA-1: 51ae49942de7507a207a653ff7d785640c49f7ce SHA-256: 58ee261f2dcc08e8601a0bc3621f1474be2649b72daeeef38f1abe79ff34d473
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector chain, likely leading to malware download or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/linkmon99-free-robux-game-hack In PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-lvl-7-roblox-executor_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/speed-hack-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/cute-free-roblox-clothes_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_off00005235.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5235 27716 bytes
SHA-256: 34fb71c7e8c6a129f70126d14ab673095db247fdf95cd7e7499bad8e4bce4ba0
font_01_sfnt_off000091ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91EE 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9C 18728 bytes
SHA-256: 0f30d46202d3006fa830fc71368988d68e9657bc7419b618a36c095f2c0b9f19

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