Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d081d9766b63c41…

MALICIOUS

PDF

43.1 KB Created: 2021-05-20 01:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 547e1c167c1c166756be608a83696fc2 SHA-1: b49daef466934d45b8dc7128da6b43a14fd45cd8 SHA-256: 7d081d9766b63c41bd5878b55baf5d71dbd0a9aa3a77b9f52d0449b181d7d6b7
220 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks and redirects to known malicious infrastructure. It also features a large number of external PDF links, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the overall structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

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-uc-sale-game-hack In PDF document text
    • http://junktiquecollector.com/images/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://junktiquecollector.com/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://junktiquecollector.com/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://junktiquecollector.com/images/how-to-get-free-food-on-coin-master_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_off000046cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46CB 29316 bytes
SHA-256: 86b93615b4756fdeb54152750c85dc80ea1070fc1533b04935673af37b229340
font_01_sfnt_off0000866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 18200 bytes
SHA-256: fe3c0b957c3a878cbf5467c5093089b5b458fb8b2624b74a356101e91c8145b9

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