Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ddaed4d8db3376…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 11:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 62ebebe75448d40facc50d8aba6beba3 SHA-1: d9ff8ff3a010683a1d04311046c57ada4d8226cf SHA-256: 83ddaed4d8db33768c25b9b42c34cd18bf370040323c046a7dffc96261dfbfaf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and generators to trick users into clicking malicious links. The embedded URLs, such as http://netcdn.tw/app/406889139/coin-master-hack-2021-android-game-hack, lead to known malicious redirectors and a large number of SEO-optimized PDF links hosted on morishita-tc.com.tw. These tactics are designed to drive traffic to potentially harmful content or further stages of an attack.

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/coin-master-hack-2021-android-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-robux-hack-sites_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-btools-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-generator-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-via-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/asshurt-roblox-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-draw-pen_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-exploits-no-download_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-for-dont-blink-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-app-iphone_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
font_00_sfnt_off00003017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3017 22628 bytes
SHA-256: 4490c235a7ac075c675b7fef5bb9c5bfe2e54a1f9a1436c2d18db80b2ef74aef
font_01_sfnt_off000062ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 18580 bytes
SHA-256: f67f88b1ce6c5db430876b5da8c68a5518a964090ab37f1ab5b5be580e390e4d

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