Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4c82606cb1a9d1…

MALICIOUS

PDF

41.9 KB Created: 2021-05-15 03:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e3e9ac227c05a3042d3e92706516b42e SHA-1: 34a1cb146d07413c42d1da0b0b7a75d790672d86 SHA-256: 2a4c82606cb1a9d19cc5a84b6185a17457db7e86be474032f9352b5b636e36d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a 'free generator / game hack'. The document body and embedded links suggest a lure for users seeking free in-game currency or cheats, which is a common social engineering tactic. The primary malicious action observed is the redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/if-you-delete-minecraft-can-you-redownload-it-for-free-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-link-coin-master_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_off0000476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x476B 25252 bytes
SHA-256: 8ff09f485a37de09b16ac27581eb69ec4f05f96a235389d25cbd7dee871af4de
font_01_sfnt_off0000805e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 18592 bytes
SHA-256: 18962371c76fb720bd28e976e47cbcb39c5d47198828412c269f5aef32a49cfd

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