Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d9d34e859ed6fa…

MALICIOUS

PDF

46.2 KB Created: 2021-05-15 05:40:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8811967d9782a7dd5e6b3e6e2da706c9 SHA-1: 6a77cefd1762eaea65a5a67b7715710aeaf31c77 SHA-256: a3d9d34e859ed6fad6a3a1209a3032cc8090371dd04a7f88ef4fc9ee9548cac6
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for malicious content, specifically referencing 'free Robux' and 'game hacks' to entice users. It contains numerous links to external PDF files and a redirector URL, indicating an attempt to lead the user to potentially malicious websites or download further payloads. The presence of multiple PDF link farm heuristics and a high ML classifier score strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/how-to-get-free-robux-without-any-verification-game-hack In PDF document text
    • http://hemmet-strand.dk/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://hemmet-strand.dk/images/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://hemmet-strand.dk/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hemmet-strand.dk/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.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_off00004b96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B96 29832 bytes
SHA-256: 79aaead798cbd9caba9cd2c3aa58107b1528b178dda98206fc5b33357bdca2d1
font_01_sfnt_off00008f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 19308 bytes
SHA-256: 301178d570ed694c8643ac68529098fd95120b57f2db1b64df12e7fbf37d492f

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