Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff22fb29750c3835…

MALICIOUS

PDF

45.9 KB Created: 2021-05-10 21:14:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c387b75503ad2b325006f7936ae6db3 SHA-1: 5a1eab6efbdba8caa1849cbc6bd04a528f06a7d1 SHA-256: ff22fb29750c383543c52d04fce49f400004668aa9f240aa95283a29f3fd4f91
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a "link farm" of other PDFs, all disguised as "game hacks" or "generators". The document body and heuristics indicate a lure to click these links, which likely leads to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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 https://netcdn.xyz/app/406889139/play-coin-master-for-free-game-hack In PDF document text
    • http://firstaidacademy.be/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-today_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://firstaidacademy.be/images/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-email-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_off00004a1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1C 27280 bytes
SHA-256: d7b67f346f9a64a122fc4ca71184dbf3cc05a04cae2ea524ceedee87c8051eae
font_01_sfnt_off000087b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B9 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000916b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x916B 18116 bytes
SHA-256: 37b7c1d52da71900fe96da67641d66084da59d3226ff1799d5ac51fdc9d2defe

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