Malicious PDF — malware analysis report

Static analysis result for SHA-256 e395843ca7b2bf3a…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 11:02:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3c05461123dafa513749ea1e7b49ff59 SHA-1: 7c6731f78bfe2f797961c02b10f75b7e66c3c3c6 SHA-256: e395843ca7b2bf3a00072bbd3de30b101fec73ff9ee04af486934ea9b6a9be24
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game-related hacks or generators. These links redirect to malicious infrastructure, which in turn hosts a large number of other PDF files, suggesting a link farm or SEO poisoning campaign. The ML classifier strongly supports the malicious nature of this PDF.

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/how-to-get-free-spins-on-coin-master-2021-game-hack In PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-minecraft-java-free_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_off000049f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F5 24324 bytes
SHA-256: 52d50ac6d781120b0417c10115314c1217396c06bf1cc2a29f40d2990408ed26
font_01_sfnt_off0000819c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819C 18452 bytes
SHA-256: 240b90d3225a309efd4f22f05c72cc9c47fc9cdac152c3e16e2e4001354cf22f

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