Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c17f5537115796c…

MALICIOUS

PDF

46.7 KB Created: 2021-05-13 09:35:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fc4b7cf0f1c9e6ca4a1780758706a0d6 SHA-1: 39e61890e4d187d66c0dfafefe220c8a0fe948d5 SHA-256: 9c17f5537115796c5b609b5d5c731ccbada461178bbe8d6183731fca8df1ac88
260 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors, masquerading as 'game hacks' and 'free Robux generators'. The heuristics indicate brand impersonation, specifically Microsoft, suggesting a credential phishing attempt. The document also hosts a large number of external PDF links, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of malicious links and the phishing lure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.
  • 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.xyz/app/431946152/game-give-free-robux-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.xyz/app/431946152/game-give-free-robux-game-hack In PDF document text
    • https://www.sauvonsleclimat.org/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/robux-rewards_GM431946152.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
font_00_sfnt_off0000486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x486A 24680 bytes
SHA-256: d46d6ce4f142d53ac50d79f09809a80144bdf0d91472d4661c283f791ac9983b
font_01_sfnt_off00008100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8100 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off000092e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E3 18736 bytes
SHA-256: 457049c0c0b067ea8a2ccaf5c24f39a354f8c872058b648fa686429afe9091ea