Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a616cbed339f92e…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 04:37:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a2cdfb4d676280562da9a53c8d4fe34 SHA-1: c93f2b561329ad66818136c2efc5d48173642ce0 SHA-256: 1a616cbed339f92eaf145cbb7d482c087423a1eb8c70380d3612047f6c3d040c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on them, promising free in-game currency or hacks. These links redirect to malicious infrastructure, as indicated by the 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt.

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.co/app/431946152/free-bux-me-roblox-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/get-free-robux-by-inspect_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-a-free-face-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/pastebin-robux-card-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/youtube-free-robux-october-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/best-apocalypse-hack-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-free-clothes-hack-mobile_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/games-like-roblox-and-minecraft-but-free_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/comment-installer-un-cheat-sur-roblox_GM431946152.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_002_off000030cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30CF 22096 bytes
SHA-256: b661afaf98841eb069cae93dcd1c5fa7b5f6f6575261576ef1b0316afb8a3116
font_01_sfnt_off000061a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 18988 bytes
SHA-256: e702ec4fff6c7073cc0441ed359cfdf4ec6402f3ca2d16ebc980be759ce6c9c3

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