Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8949acac8536aab…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 14:39:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a372ca87e9dfc52b6c365278d2b0001e SHA-1: 6cce5777ba8fccd9fed90fe4295ed622f6233462 SHA-256: a8949acac8536aab0a2ae00e0b7cf27cdd088d437486b6fb983248a20a59c1bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-rewards-app-game-hack, which then leads to other PDF files hosted on tena-g.hr. This indicates a multi-stage lure designed to trick users into downloading further malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/coin-master-rewards-app-game-hack In PDF document text
    • https://tena-g.hr/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-apk-114_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_off0000489a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489A 25228 bytes
SHA-256: f2aea88b540288ec99591f8e5ead6bfbf8c88c79edfe9428445b69fdafa8c0de
font_01_sfnt_off00008249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 18060 bytes
SHA-256: 1ace4c7085401291f58e102c272718a2ec9341f0a4396f264039734a0ad902b6