Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cedcc459ba2763e…

MALICIOUS

PDF

44.2 KB Created: 2021-06-13 14:52:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 648675cf93589bddcb618a40189d567c SHA-1: 3590b68976e5a841faac81f902d2d0f42c12ae07 SHA-256: 2cedcc459ba2763eb6e34b4cda9ef518794e13ef71a447a156e53e829ebc5c89
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on what appears to be a link farm. The primary lure is for game hacks and free accounts, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially obfuscated, contains references to 'Roblox Free Exploits 2021' and a URL that aligns with the malicious redirector finding. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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 http://netcdn.co/app/431946152/roblox-free-exploits-2021-game-hack In PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/roblox-plaza-how-to-cheat-a-big-win_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/avatar-the-last-airbender-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/ulgamesresources-com-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/android-coin-master-hack-2021_GM406889139.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
stream_004_off00004f0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0F 24836 bytes
SHA-256: c8c7ec4f5083ab5583a45c2892b978d8918d35d12f447e866fcf2a78191aca41
font_01_sfnt_off00008877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8877 18748 bytes
SHA-256: 7634530b0248a565fa50e361dcc6bac6271d882e287bfa82a62b3e42c5eb283f

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