Malicious PDF — malware analysis report

Static analysis result for SHA-256 93723f0a8b002e06…

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 08:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 56669f2c443e9e1c51826a3c64437bc1 SHA-1: 3578f1b0efaffc1485980b708858e53bc0526dea SHA-256: 93723f0a8b002e0682af9dd16ac31f58b4d086c70b8bff9792d80a927742ec74
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as generators for popular games like Coin Master and Robux. The document body and embedded links explicitly promote 'hacks' and 'free generators', aiming to trick users into visiting malicious sites. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/406889139/coin-master-hack-ios-download-2021-game-hack In PDF document text
    • https://allpi.int/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://allpi.int/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://allpi.int/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://allpi.int/images/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • https://allpi.int/images/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://allpi.int/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://allpi.int/images/how-to-download-minecraft-for-free-on-android_GM479516143.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_off000047ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AB 24712 bytes
SHA-256: d5eab25b4c6a0c9778426d5605eb1295f906d0bc5d382b3a7c13d51f09f44b88
font_01_sfnt_off00007f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8C 18696 bytes
SHA-256: 11ecf461d2f98c74c154dcc560692411ec3e38438efbd345bccaad7f825d81b7

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