Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3d09f89c294ce1…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 13:51:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8403149704cf8ed3307b24565e528c45 SHA-1: c5e16f75804716afdd158254319c8e91dbad1813 SHA-256: 0a3d09f89c294ce169fb3e6df1c07dd6d7ce00d2491fe48ccff4053124f80004
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of 'Free Robux 2021' and impersonates Netflix to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure. The document also displays a fake CAPTCHA, intended to deceive users into executing commands or interacting with the malicious content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-2021-game-hack.
  • 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/free-robux-2021-game-hack In PDF document text
    • http://digilib.iailm.ac.id//repository/tiktok-free-50-followers_GM835599320.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/mathep_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B7 24460 bytes
SHA-256: 54eed99ec644356b5917683229ca0a2af1a0b0160c59276264f3d1a5377a7436
font_01_sfnt_off000088e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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