Malicious PDF — malware analysis report

Static analysis result for SHA-256 1624ca1f082c7551…

MALICIOUS

PDF

36.1 KB Created: 2021-07-08 17:12:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 75f40cb5b7244ac0459fdf1061aa5348 SHA-1: 53c09cc4b0b8f651bf01641c8f826e034f459b96 SHA-256: 1624ca1f082c7551065991a90e1d0739552d68e948dfe5c109c461a33548bc24
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. It contains numerous links to redirectors and SEO-optimized PDF files, suggesting a campaign to drive traffic to potentially malicious sites. The presence of a known malicious redirector URL indicates a high likelihood of malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-on-coin-master-2021-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-through-walls-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-tower-of-hell-roblox_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/hack-para-tener-robux-como-tener-robux-gratis-enderrobux-117_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-roblox-btools_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/what-free-program-for-roblox-shirts_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-robux-cheat-youtbe_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/robux-now_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-robux-on-roblox-for-free-download_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-god-mode-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/easy-coin-master-hack_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_002_off000034c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34C4 23384 bytes
SHA-256: 796735308b309c6113c44e1aaeaf739579e5406b895d856fee977e341830309c
font_01_sfnt_off00006967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6967 18576 bytes
SHA-256: 592e144e19b3a0fb235169ea68d8700deb7f7882d554043d1d7a76374456614b

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