Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c97e8d1b68dde0…

MALICIOUS

PDF

33.8 KB Created: 2021-06-29 09:59:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f0be4439ce97c41d7058ce4f438f44d4 SHA-1: b273e2c1e528a7f7d341eb18f9c89d270f2c5ef7 SHA-256: d1c97e8d1b68dde076aceb0da0628597215dfb11affcbfbc82467e30f574e20e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites that appear to be part of a link farm or SEO manipulation scheme, designed to lure users with promises of free in-game items. One primary link, http://netcdn.co/app/431946152/free-robux-adder-game-hack, is flagged as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt to drive traffic to potentially malicious sites.

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.co/app/431946152/free-robux-adder-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-fire-tik-tok-2021_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/i-want-free-robux-please_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-studio-ship-script_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-account-taker_GM431946152.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
font_00_sfnt_off00002e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5A 22096 bytes
SHA-256: 750599ddef6bb86b9ae712601f9b131f7f30efd6695ece8206b2373cdbf107aa
font_01_sfnt_off00005f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F95 18888 bytes
SHA-256: fed93a57f9ebc49998933260645548d38829a68d40f64c31f5643833283864c8

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