Malicious PDF — malware analysis report

Static analysis result for SHA-256 52aa5095cc00b55e…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 18:34:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5d35826f3445cfeb8bf157a0401a9f42 SHA-1: 8815cab9db5e2035d6852632d36a1f751c99f566 SHA-256: 52aa5095cc00b55e6f7176b9d54e49834196b24a7747c05b7033317891437850
220 Risk Score

Malware Insights

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

The PDF document contains multiple links to external resources, including a primary redirector URL associated with game hacks and free generators. The document also hosts a large number of links to other PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures indicate a potential for driving traffic to malicious sites or delivering further payloads, aligning with common phishing and redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/coin-master-free-daily-spins-and-coins-game-hack In PDF document text
    • https://www.gymun.cz/images/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/fighting-free-card-coin-master_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_003_off00004c37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C37 24180 bytes
SHA-256: 9e0f56e945e6eb1170e18453afa2413f72518494c358a90013091ece52b13ccf
font_01_sfnt_off000083bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BF 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00009045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9045 18480 bytes
SHA-256: 88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b

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