Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a26fce605b95d…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 09:22:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 949e412c9b469e0ba162ae8ebff520b8 SHA-1: 73844b8e4f48095aca6bb821e7fb5af4fd7110eb SHA-256: 957a26fce605b95d337e64445b373aad0cc0aca088786dbea47b0c639f3dfbd2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are identified as malicious redirectors or part of a link farm designed for SEO manipulation. The document body and extracted URLs suggest a lure for free game items or hacks, likely leading to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/free-spins-coin-master-march-2021-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/discord-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-grab-knife-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-hacks-in-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/island-life-paradise-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-hack-pastebin-youtube_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-bc-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/pokemon-go-free-account-generator_GM1094591345.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-redwood-prison-free-swat_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-code-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-for-coin-master-game_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
font_00_sfnt_off00002ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC3 22516 bytes
SHA-256: 5cba63e1b0968990c2f3e073e0d8dfb2ea0a7e86377a890c159c8ff180cc90a5
font_01_sfnt_off000060e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 18744 bytes
SHA-256: f992392ed04d58b53e0de1c6bbd6ac77b4f3b3aa4afbe9104984b67ade831bee

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