Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a5322a07729fb…

MALICIOUS

PDF

34.9 KB Created: 2021-06-22 08:09:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a409986b322659866ca8ea1910d2bf04 SHA-1: 095f71b8b1b7cd749214fd9341ceedb583770e4b SHA-256: bf9a5322a07729fb2ad16a5eb23706ce6496f94d199904888c587056ebf3bb35
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking embedded links. The primary link redirects to malicious infrastructure, and the document contains a large number of SEO-optimized links pointing to other PDF files, likely part of a link farm designed to improve search engine rankings for malicious content. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-robux-easy-and-quick-game-hack In PDF document text
    • http://gc-sistemas.com.ar/images/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/booster-game-pc-free-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-cheatszip-file-size-813-kb-md5-value-94bfbfb41eba4e2021202111f2021f6_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-jailbreak-free-vip-server-link_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-boku-no-roblox-remastered-hack_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/hacked-roblox-shirt-forums_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-use-python-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-hack-stealing-items_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5D 22636 bytes
SHA-256: 499f25014dde29723036feea06bf8f323c0ce092c320045ff7219732bc61223d
font_01_sfnt_off000060e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E7 19784 bytes
SHA-256: 947de2f8e583b44caf4bd95a066a4fdb995372dafa1685aed2e1bcd33f50b804

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