Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d37d7d9df2e238…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 20:46:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 67259d736ee8ef965124bd6add6897b4 SHA-1: 0ebfe25099c99c7f332b86dfee704f3038ed6f9a SHA-256: 97d37d7d9df2e238246378436539659b9c7c9f9953cd0e22642a60ab28a2c240
220 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and SEO link farms, which are commonly used to distribute malicious content. The document body and extracted URLs suggest a lure for free game items or currency, aiming to trick users into visiting these malicious sites. The presence of numerous external PDF links indicates a link farm designed to improve search engine rankings for malicious 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/1094591345/pokemon-go-free-balls-2021-game-hack In PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-client_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-spins-free_GM406889139.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_off000049d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 24508 bytes
SHA-256: 51d9c79013fa6ad7907d93035b1e38795a237a8727797d60b972584eacd33be5
font_01_sfnt_off0000823a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 18764 bytes
SHA-256: c0a534e182e6675d24c78d34703ea0fe5d4fb7de0972bd149f64da562c3f469e

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