Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b146509f97acbd…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 15:29:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 85b615d35d976514be4300e0739ad324 SHA-1: 77d1c5c51adbb18b8cdc6d013e1e00dd9a9cd9c6 SHA-256: 92b146509f97acbddc3f32d618b681e019e277b9c92fad4c0093266c2d375aa9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free in-game currency and hacks to trick users into clicking malicious links. It contains numerous links to a redirector and a link farm, indicating a phishing or scam campaign. The primary malicious URL identified is http://netcdn.co/app/431946152/how-to-get-a-lot-of-robux-for-free-game-hack, which is associated with known malicious redirector infrastructure.

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.co/app/431946152/how-to-get-a-lot-of-robux-for-free-game-hack In PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/app-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/youtubers-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-promo-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-how-to-get-free-clothes-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-character-maker_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-synapse-exploit-download-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-your-friends-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-items-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spin-link-today-download_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_off00002f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F31 22564 bytes
SHA-256: 1fa6bcdf3026e39d5f794f18fd15c491d0bae2190c21de7c41803fce730c0365
font_01_sfnt_off00006181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 18984 bytes
SHA-256: cc419f11dc5c3727b9745e43bd888fd0b62490c0079d6f890fae8e30572cbe56

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