Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a3a7493cec38aa…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 05:36:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bd76b3756c0cb0c95c6905074147fb79 SHA-1: 796ace8c3d9ca6470d3638ee59e298c18321af51 SHA-256: 31a3a7493cec38aa66fcbbc0d1167691e13f3b07c26a711841dcd1cdb335a8c1
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free game hacks and downloads to entice users to click on embedded links. The primary link directs to a known malicious redirector, which in turn leads to a large number of other PDF documents, likely part of a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or redirection to malicious JavaScript content.

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/479516143/minecraft-free-download-mobile-game-hack In PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/robux-com-free_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dinpertan.grobogan.go.id/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFE 25360 bytes
SHA-256: d80499fa6c93cb909d9c8a40574f0179f8ce28fe6b93df2f82edc24609e30551
font_01_sfnt_off0000850e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850E 18448 bytes
SHA-256: 1515dea36b54f390db2656cd1e78578212b0857dcc74367194bf1f7b23864c35

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