Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c713b08bf0e893b…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 10:10:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a40c0649b6cac776f42ade305e4c44e SHA-1: 168a606e5062fffad445a7e24ab5ae9a7261146d SHA-256: 7c713b08bf0e893b41170028bb2ae5e96d452d5f6716826445d8c96023669c27
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'game hacks' and 'free generators' to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves other malicious PDFs hosted on tw-storage.com.tw. The document's content and embedded URLs strongly suggest a phishing or scam campaign aimed at users seeking in-game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • 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.
  • 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 https://netcdn.tw/app/431946152/roblox-hack-rs-2021-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://krnl.rocksIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFE 25600 bytes
SHA-256: d13ce311c600d1393d788c6e4be6fc943c1fb54c3a5ef1add2906d1c4444d8ae
font_01_sfnt_off000086eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86EB 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000090d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D6 18584 bytes
SHA-256: 09e382df304bf090e7d4979f9a4a25aa7e11969d647bdc760e706e621b680adc

Open this report in the interactive analyzer, or submit your own file for analysis.