Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236334fb4a14dbf…

MALICIOUS

PDF

58.2 KB Created: 2021-06-03 08:11:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 152ce02424e51ba8102d843a7b71e8bf SHA-1: 6ae44c6f17e68b64e16ac8665fe187874ada271f SHA-256: 1236334fb4a14dbf5df696f70c1cbc50beeb0027590f013c3fe7c6d6e7731a3f
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks, specifically mentioning 'free Robux'. The document body, though partially corrupted, contains a URL pointing to a site offering 'ways to get free Robux game hack'. This suggests a phishing or scam attempt designed to lead users to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/431946152/ways-to-get-free-robux-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D2 37144 bytes
SHA-256: f897eb5dec2678aa682f7c61132f323c63e46cf253bf92ddf454863efe590952
font_01_sfnt_off0000a625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA625 4008 bytes
SHA-256: 265a7073fe898a0a4ead4e4c0d4bd8c93ab00cc3457fa346bff37cd70b4b6444
font_02_sfnt_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 18724 bytes
SHA-256: b2cd5ec598a8c260812e966e9710fb38f03066217a6d0ec8f431d8a9dca8af42