Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd96a0baff377da…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 17:59:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2efc95e2faf6a9e6d8e155bbe008a82f SHA-1: b3f8312928f6024dec7f40ad81dec82a4ac938b9 SHA-256: efd96a0baff377da20a90f8328dcc5f2d857307c76754c7d4f74f2d3d97d2f42
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. It contains numerous links to external PDFs hosted on an IP address and a known redirector, suggesting a campaign to drive traffic to potentially malicious content or download sites. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF links points to a link farm or SEO poisoning tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • 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/argent-infinie-lumber-tycoon-cheat-roblox-engine-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-coin-master_GM406889139.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-commands-list_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/money-cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-gamepass-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-fast-and-easy_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
stream_004_off00004e6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E6D 27844 bytes
SHA-256: efec88fadae7a3fa26e943d2c59f79cedfcb4dc9303cf72adce0d0afe888624e
font_01_sfnt_off00008e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E02 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000097b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 19272 bytes
SHA-256: 4444e799ec9a1d4ce036d940a68b2fea7b119feb145c5d263705617b0e812915

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