Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c405ff4886cb6dd…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 21:40:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9094ae783691073d2d7f7bce580ca810 SHA-1: 39b71b38e1f959afc2ed9719b10a5b527f56770e SHA-256: 1c405ff4886cb6dd6ddba51f9ea0a499f678b8122483cd2308dd6599a2a88017
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as offers for free game items. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' indicate that these links are intended to lead users to malicious infrastructure. The document body, though partially garbled, contains text related to 'Coin Master Free Spins' and a URL that aligns with the malicious redirector finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-spins-link-31-march-2021-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-spins-hack-2021_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
stream_003_off000049b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B5 25852 bytes
SHA-256: 103cb1d75e9f42400404de4cee358c68c5a219be4187c812c683454f9e237918
font_01_sfnt_off000084ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CE 18796 bytes
SHA-256: 8fe5350273ebf35537686b917703007ab31f8899d424a5c1b3df5b865f6c5881

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