Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a01cd6641ab7dff…

MALICIOUS

PDF

42.0 KB Created: 2021-05-20 04:48:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ca9f7c68067c90fbb96d508658b75cbb SHA-1: f814a60b426763a1ee7e7370fe676035501a1c15 SHA-256: 5a01cd6641ab7dff46fa36381f5b7e9989fca9203378f1aa4c4aba4db730513f
220 Risk Score

Malware Insights

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

The PDF contains numerous links, including a primary redirector to 'pubg-mobile-uc-xyz-game-hack', designed to lure users into downloading potentially malicious content. The presence of multiple SEO-optimized PDF links suggests a link farm intended to drive traffic to exploit or scam pages. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious workflow aimed at user deception and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/1330123889/pubg-mobile-uc-xyz-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hacks-that-work_GM406889139.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/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-followers-hack_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.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_003_off000047ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BA 24528 bytes
SHA-256: d2f40d4c9780a5d9c548b3edd1988b4a6348e35ede3412daec110a9d0221b58b
font_01_sfnt_off00007fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE2 18920 bytes
SHA-256: 062a94d8a9023789404bba4247d3de02d44fa1709526ec57f0c5308fc8e966d0

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