Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5281ac05455f90e…

MALICIOUS

PDF

45.6 KB Created: 2021-05-11 00:18:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b9c2db97e8d8e9c18a6ecfdeda37d877 SHA-1: 2abdb2b7c143dab55af2485c1db1d7b21fe629af SHA-256: a5281ac05455f90eb5b9ba3c312b8d119baf206d680263d8e28274223ec43fa0
240 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or free downloads. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body, though heavily corrupted, contains a URL that aligns with the heuristic findings, suggesting the primary goal is to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.
  • 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
  • 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/479516143/minecraft-story-mode-free-download-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-online-games-like-minecraft_GM479516143.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_003_off00004cbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBE 25084 bytes
SHA-256: d1ee4a07dc9b0efaab4e2fe93943261bd6e51a53d0321b0ca9ca09f12191e978
font_01_sfnt_off00008559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8559 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFA 18468 bytes
SHA-256: b60985c1befe233451c1e4628b3545798255342bb86f0eafc92eb610c8c57488

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