Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f05ad6dd969f20d…

MALICIOUS

PDF

37.1 KB Created: 2021-07-04 01:04:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2186b39144574f80f94789f9911e86f0 SHA-1: dc5923285fc01fe6539022a6b7c99309642812f0 SHA-256: 8f05ad6dd969f20dcc0c2fa50c31aeef853e38eef30db70213aefb2e5bedbf05
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous external links, many of which are SEO-optimized and point to other PDF files, forming a link farm. The primary URL, http://netcdn.tw/app/406889139/free-coins-coin-master-daily-game-hack, suggests a lure for game-related cheats or hacks. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-coins-coin-master-daily-game-hack PDF link annotation
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-ways-to-make-your-roblox-avatar-small-rthro_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-any-roblox-account-july-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-phone-number-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/pingu-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/want-free-robux-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hacken-on-roblox-hin-zuzu_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-every-5-seconds_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/5-dollar-roblox-gift-card-free_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/dragon-ball-x-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-lumber-tycoon-2-hack-xbox-one_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/como-conseguir-robux-gratis-en-roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-just-download-a-game_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_off000039df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39DF 23216 bytes
SHA-256: b2ae5453c321c5cb66f2d830b8901a65c0324830ca0b164fe97a52679b5bc03c
font_01_sfnt_off00006e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E30 18420 bytes
SHA-256: cd14d3499d0896603ac511e8ded95f3ea65909835c91c73eca58e3f383c3161c

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