Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce16656f8f6afb9…

MALICIOUS

PDF

44.4 KB Created: 2021-05-11 06:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 53ded10917d0fc16a34efda22291893b SHA-1: b7c9e23bb61285d0d26446e7c2ccb0bc8c03820e SHA-256: cce16656f8f6afb9becc58d9f5a0bd34eda3c3290a9823d7d7202324a12b53b9
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure to trick users into clicking links for game hacks and generators, which are known malicious redirectors. It also explicitly requests sensitive recovery secrets, indicating a phishing or credential harvesting attempt. The embedded URLs and the IP literal point to infrastructure associated with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/406889139/coin-master-free-link-game-hack In PDF document text
    • http://183.91.70.11/repository/coin-master-free-food-for-pet_GM406889139.pdfPDF link annotation
    • http://183.91.70.11/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-daily-rewards_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_003_off00004894.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4894 24464 bytes
SHA-256: 8dc84e9772481c8507a2be769855e76faa86dbe81cbd22684e04d58585a5d931
font_01_sfnt_off0000805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C46 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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