Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1af75799dc3ed43…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 20:49:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f8c5c7ec4ce1fdc42c0627439493b81 SHA-1: 516dee43d98be90b1f8c88e4f4bef4486fa6cc04 SHA-256: b1af75799dc3ed434454ae114f8fb8eee45a82141187474d244efee8baf3a9af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, disguised as a 'Coin Master Free Spins Link Quora' lure. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading potentially harmful files related to game cheats or virtual currency. The presence of a malicious redirector link indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-quora-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/jentplays-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbxcity-free-robux-instant-payout_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-prison-life-in-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cool-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-accounts-not-banned_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-jailbreak-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-do-i-recover-my-childs-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-gift-card-codes-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-sharingan-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-websites_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
stream_002_off00002db4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DB4 23172 bytes
SHA-256: 17606ccf2450753702f708bad6e7908bad1e069e89dcecb7b42da2e01a18b56e
font_01_sfnt_off000061fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FC 18640 bytes
SHA-256: 854813a0d1d296087869f9650f2c8127593c4544be73c34457aa680c0b691141

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