Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbd9a2e4695eaba…

MALICIOUS

PDF

45.7 KB Created: 2021-06-07 20:27:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 212ea366d4d81a66a277dd0c8e5e97ec SHA-1: 46f975f059ec12d93af65a9faab8a5c3318185cc SHA-256: 7dbd9a2e4695eaba87466ab4b15a0991228b075830c6dabeff892688f1b7fa42
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one that redirects to known malicious infrastructure, disguised as a 'free generator' or 'game hack'. The document body and embedded links promote free game currency and hacks, indicating a social engineering lure. The presence of multiple external PDF links suggests a link farm used for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-instantly-2021-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/everything-free-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-tener-robux-gratis-sin-hack-ni-admin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-through-walls-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-elemental-battlegrounds-hacks-win10-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-hackear-los-robux-de-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-hack_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_off000050b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B1 26192 bytes
SHA-256: b950ef3318899f7ded82d7481e49e95313f72d428e15853a477896838ec1155e
font_01_sfnt_off00008db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB0 19004 bytes
SHA-256: b14ed0cdc9a3f1d18ace976c129e2f01933f622b006d4fa44807cc1d6c02a477

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