Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d1ff9cff6781b5…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 06:22:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6efffdb6379ab3397ae7f21ca9d88961 SHA-1: 65c735fe417dce7485ef143e93bfb344bc6358c8 SHA-256: a6d1ff9cff6781b5bf41a0efd4b9edc1281677fc0d459d75a7f78b972f689807
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free in-game currency, specifically 'Robux', which is a common tactic for phishing and malware distribution. The document includes a link to a known malicious redirector infrastructure, which ultimately points to a PDF hosted on an IP address. This suggests the initial PDF is a lure to download a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/get-free-robux-fast-and-easy-no-offer-no-verification-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-back-accessories-roblox_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-accounts-2021-may_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-csgo-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/script-hack-2021-roblox-bubble-gum-simulator-free-passes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-shades-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-in-1-sec_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-u-get-free-robux_GM431946152.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
font_00_sfnt_off0000516b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516B 25140 bytes
SHA-256: eae92d66202ede848dc668538951882a444386f319de98156a3228a47fcd15d2
font_01_sfnt_off000089e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E4 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000968b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968B 18952 bytes
SHA-256: 622b9c4f755bafe2d3aa338c3fc9206871e2f29a90a4ce6ded14062f36001a46

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