Malicious PDF — malware analysis report

Static analysis result for SHA-256 82396f9a3f4fb810…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 22:10:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3df959434d73205abe9c17dbd31502eb SHA-1: 6a6b8590ea3554759b1f5e0b21c0346212baeabd SHA-256: 82396f9a3f4fb810d81d0d16ce7cd5dff057375491b3d1d785863f2878245288
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector URL, designed to lure users into clicking on what appear to be game hacks or generators. These links lead to known malicious infrastructure and a large number of other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains references to these lures and the primary redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-spin-coin-master-online-game-hack In PDF document text
    • http://greenoase.be/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://greenoase.be/images/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/free-daily-spin-coin-master-game_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_off000047b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B2 27376 bytes
SHA-256: b57baecb06702230f6ffd681c9e5a22e67d56bb7c2cdcdcbb672d0c9f1ea5bc7
font_01_sfnt_off0000862b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9016 17960 bytes
SHA-256: 74290823a42a0e75a5f3b604468006cc436fdd58a7c76d339be163c45ff8bb63

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