Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1da8ae3db6b3965…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 09:37:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 61c9ff1764c74e55b5388274554a22cb SHA-1: 974dfda3e4eba119ea55c92f3402396f0d421769 SHA-256: d1da8ae3db6b39656f5a5592fe529bacc9eebce5aa866ad5fb75ce0cef70f886
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and SEO link farms, designed to lure users into clicking on potentially harmful content. The document body explicitly mentions 'Free Robux Generator 2021' and includes a URL pointing to such a generator, reinforcing the lure. The presence of numerous PDF links suggests a strategy to distribute malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/free-robux-generator-2021-game-hack In PDF document text
    • http://lib.mappifhui.org/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-through-coin-pop_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_004_off00005373.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5373 24452 bytes
SHA-256: e22fc2c54c02d0f0cdaa13f7e55ec2be509adf52bf6e684b9c571f25c95672bd
font_01_sfnt_off00008ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off000095b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B8 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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