Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e0b58269623a34…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 00:44:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 60a98b714dfbccf98582254a514cef2b SHA-1: e800f5693bfec77a8fd4e8d0fac2481242edd2f1 SHA-256: 80e0b58269623a3458e99ac48c6ef35719b6805a75461fc0e7620d83e8f0665a
220 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users with promises of free in-game items and hacks, directing them to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that aligns with the lure. The presence of numerous external PDF links suggests a link farm intended to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-make-a-group-for-free-on-roblox-game-hack In PDF document text
    • http://foo.com.tw/files/free-catalog-stuff-roblox-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/cheat-commands-in-giant-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-use-cheat-engine-with-roblox-games_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-kick-players-roblox-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005175.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5175 25252 bytes
SHA-256: 68d30c654f1db82c0c250254a07e8b6f89e9e8470f36a1461f5480c52c8829d5
font_01_sfnt_off00008b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 19020 bytes
SHA-256: a3631cb417710c326646104897b41b8ab32d5b09a49df0343d29817ef505bda8

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