Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81005910ba2c8c2…

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 19:58:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5cf8a2624b1e54b83a989adfb8cfe989 SHA-1: c88963d8307a2135306785c59ece82a51cf2cbc4 SHA-256: f81005910ba2c8c264b7e45aab1183068c9c3ab2c613ddc5c0f313b0c32fece7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, including a known malicious redirector at http://netcdn.tw/. The document body and heuristic firings indicate a lure for game hacks and free items, a common tactic for phishing or malware distribution. The presence of multiple PDF links suggests a link farm intended to improve SEO for malicious content.

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/431946152/how-to-get-free-shirts-on-roblox-game-hack In PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-black-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-lighting-hack_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/promo-codes-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-coregui-hack-making_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-prize-giveaway-roblox_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_off00003308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3308 22900 bytes
SHA-256: f578ae873418e5cdc588925bc4a087f8ecce51d398e22f869cccb17c5213f512
font_01_sfnt_off0000664b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664B 19204 bytes
SHA-256: e564b9fc2e140727ee1b3efd73c6db7bf36275a1618ea5ca2a83f85cebd447d7

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