Malicious PDF — malware analysis report

Static analysis result for SHA-256 85742869afefe628…

MALICIOUS

PDF

43.9 KB Created: 2021-05-13 23:41:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6aa89a3fd5983232ae358b7a053b59d9 SHA-1: 86fcb4f963cf92c07d0e29b0d4c669d5d0004b32 SHA-256: 85742869afefe62819d02292dc7fc630753face1066aae260f696a100c92f137
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links. The primary lure appears to be related to free game items for Roblox and Coin Master. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or scam attempt. The document body, though partially corrupted, contains text related to 'free Roblox clothes' and includes URLs that are also present in the heuristics and IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-roblox-clothes-game-hack In PDF document text
    • http://dcmetroapp.com/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-minecraft-printables_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_003_off00004c78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C78 26052 bytes
SHA-256: b402408c653a370f50211599daab15a9647308d2af57a9d97caf6dfb7eac4286
font_01_sfnt_off00008986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8986 18216 bytes
SHA-256: e50810547e3c30daf02b15d5ac458835679762fa1a68c20d7c153a389bd1cc19

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