Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62f1ef867f246b8…

MALICIOUS

PDF

33.8 KB Created: 2021-06-27 11:59:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c20b6e292aacde0d017158b6c0e6cf4 SHA-1: 779509473377eff874581327633c41053cb0b1da SHA-256: f62f1ef867f246b8a34e330554d553c9fac833afdd7db2ffc8d6d40d9e7821d7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-robux-givway-game-hack. This infrastructure is used to lure users with promises of free game currency or hacks, likely leading to further malware downloads or credential harvesting. The ML classifier also strongly indicated maliciousness.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-givway-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/pokemon-go-free-promo-code-2021_GM1094591345.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-hack-999999-robux-no-verification-in-pc_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-aockolupse-hack-mod-menu_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-vehicle-simulator-script-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_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_off00002e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3B 21716 bytes
SHA-256: 8c74d724ada71801d825736cda2d06a4d5315e23a4b4458b95a5858d6dd49b1b
font_01_sfnt_off00005e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 19296 bytes
SHA-256: 50056e14bde831bdcfcc0f64e14f6426d59befca4fb3c00f7000a4cd83a97f53

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