Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ac07e6e7f6bd0b…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 01:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d1a869bd4326134a4bef5bff53e74ae3 SHA-1: 55366479887a186aee849a35739f8ab09a73da56 SHA-256: 79ac07e6e7f6bd0b2dac1f42a24613e7a58abc4eed13679d2b91dc11501b2cd6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appear to be game hack generators or free currency sites. These links lead to known malicious redirectors and a large farm of SEO-optimized PDF links, indicating a phishing or scam campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/479516143/minecraft-pe-apk-free-download-game-hack In PDF document text
    • http://iglesiashispanas.org/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://iglesiashispanas.org/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://iglesiashispanas.org/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://iglesiashispanas.org/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://iglesiashispanas.org/images/free-robux-quiz_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_003_off00004b1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1C 24216 bytes
SHA-256: 7e2502b001aeaf399bb7d04b3060c89f5165928dcc703d4a18c3d505542dfbff
font_01_sfnt_off0000828e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828E 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2E 18788 bytes
SHA-256: 56ecf13b7fdae58d5e4afb69efa7bdb7b8d9a7a0932eb3c661bed49813117ab2

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