Malicious PDF — malware analysis report

Static analysis result for SHA-256 5812492e6bf797d1…

MALICIOUS

PDF

45.2 KB Created: 2021-05-12 07:42:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ad957a35a51f57104678369b611bcfa SHA-1: a98888d738bd3827f4cf67f1666fd78c5a3aed46 SHA-256: 5812492e6bf797d19023c2ec8026269739d963ef054058c409403205fb5877c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/free-mod-apk-coin-master-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD6 25068 bytes
SHA-256: 3ad1120b977ba2912b0b827b811157a366676f2e79aaf55f478468ed5d48af6d
font_01_sfnt_off00008442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8442 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2C 18228 bytes
SHA-256: 94a160b3eebda81a774dce60345efae5de7f6df629fda5b11a26048b94d99866

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