Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ff7c1aa7cfa663…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 11:52:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 30e9d35d31b97c0df4c15488bfcf8cef SHA-1: 9801217890fa3dac81bddcc265711dc8e9faf39e SHA-256: f6ff7c1aa7cfa6632de9d77fab96e689f9d7491ab6e0b8d0656126e1e1d6ed81
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as offers for game-related content like 'free generators' or 'free accounts'. The document body explicitly mentions 'On Roblox Someone Hacked Me And Lost All My Robux' and includes a URL pointing to a 'game hack'. This indicates a social engineering lure to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/on-roblox-someone-hacked-me-and-lost-all-my-robux-game-hack In PDF document text
    • https://www.manmed.info:443/images/free-pokemon-go-accounts-level-35_GM1094591345.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-free-robux-no-verification_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_004_off0000507f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507F 30124 bytes
SHA-256: 1c8da1a0b0da736bb4cad42329073ffc1dd34864fbc8233112519d9acf4ed933
font_01_sfnt_off0000939c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 19236 bytes
SHA-256: 66a98a0cab558d7de7e7bdb5bf4aa64b571077f7522014c959db56ef39f5d2a0

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