Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bd1ccf6660f656…

MALICIOUS

PDF

50.8 KB Created: 2021-06-03 04:56:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d372a853732f5dffd767e93d12ddbff9 SHA-1: 04e8f6eacc6099a7fab19defcfaeda9aace9f2e3 SHA-256: 19bd1ccf6660f65621a0496c254f1a97225c631c494236f90308342649c01ea0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a free game generator or hack. These links redirect to malicious infrastructure, specifically identified as a known malicious redirector. The document body, though partially corrupted, contains text related to 'free Robux' and a URL that aligns with the malicious redirector findings. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.online/app/431946152/how-to-get-free-robux-easy-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-account-givaway_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-no-verification_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-t-oget-ant-free-robux-item_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
font_00_sfnt_off000053d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 29388 bytes
SHA-256: 40d7305ff92dabf5a463b30cf9fcad1fdbee80cfe75b2feed982ca895d919e91
font_01_sfnt_off000095e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E6 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA28E 18688 bytes
SHA-256: afa93f6b5b78c11c56913a3e0021d293f85f1b4278f41e2b8713ad9a89f051de

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