Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee4f259290a5ecb…

MALICIOUS

PDF

45.6 KB Created: 2021-05-18 02:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8fdd010e4ba999e39ea0de0b48ec49e SHA-1: d0a78ae605c04af151264af8313a181e916f7c30 SHA-256: 9ee4f259290a5ecb06c1b8ca03c5a50dda0da7effc0a569aabb16bc61eb91733
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites and PDFs, many of which are associated with game hacks and generators. The primary lure appears to be 'free Robux' or 'free spins', a common tactic to entice users to click on malicious links. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/how-to-get-free-robux-for-free-game-hack In PDF document text
    • http://dqdq.pl/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A80 25480 bytes
SHA-256: 3355999331fa6045e9d7584f2fd2cf9725ce3dd4b9425e03f4dbb0d082f460a5
font_01_sfnt_off00008506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8506 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00008fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAB 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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