Malicious PDF — malware analysis report

Static analysis result for SHA-256 549bd307db47987e…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 10:17:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6f5205aefed1ae34ea3e9d81128f0764 SHA-1: ba6002dd91c5ceef14630bca0aab889e537ef40a SHA-256: 549bd307db47987e863a080e57e1e9f7a452889f4808f18fe8db5fedec28701d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, disguised as "free generators" or "game hacks" for popular games. The document body, though partially corrupted, contains a URL that aligns with the lure. The presence of numerous links suggests an attempt to drive traffic to potentially malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-hair-roblox-game-hack In PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/oginject-co_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.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_off00005193.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5193 24352 bytes
SHA-256: 97d3e6c4d49212b74085988734bb810ef374597034b8aedb5f8583fb320e6247
font_01_sfnt_off0000892b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892B 18296 bytes
SHA-256: a0599e440df83d1220524ed19e510b9c2f6a3db0fbd0aff9e889db947f6eea7b

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