Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e5abde45c21b3d…

MALICIOUS

PDF

41.4 KB Created: 2021-05-15 16:30:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ab13b185c9726f06284db4113157aa95 SHA-1: 8f8517b843be5131b389ece379842bccb329ff9a SHA-256: a6e5abde45c21b3dbb8c05fa6f271cc73ffd8358aa6fd2fc786044494ac01973
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as PDF link farms. The primary lure appears to be 'free Robux' or game hacks, indicating a phishing or scam attempt. The document's structure and the presence of multiple SEO-optimized links suggest an effort to drive traffic to potentially malicious or ad-heavy sites, possibly as a prelude to further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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 https://netcdn.xyz/app/431946152/free-robux-not-fake-game-hack PDF link annotation
    • http://karolinaherrera.com/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://karolinaherrera.com/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://karolinaherrera.com/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://karolinaherrera.com/images/apps-for-free-robux_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_off000046c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46C7 24332 bytes
SHA-256: 624eb5e074970bb85ec12ba9dd536f212fd152069730a992fa5b7ed25e2ccc0a
font_01_sfnt_off00007e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E88 18516 bytes
SHA-256: ca79d80576681ece98af22104654f282f19bfdcccdd95bbb76316d29f9029162

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