Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f22d6113db3602…

MALICIOUS

PDF

45.7 KB Created: 2021-06-11 06:51:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9f4595f5c90c9f03ba92788c56579383 SHA-1: ccc33f33e2d593ba65d0a62c8394ecc300193ef8 SHA-256: c7f22d6113db3602eae672802778213e14431403c6e20404f1f4c23bde557eb5
260 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on domains associated with SEO link farms and malicious redirectors. The document body and heuristics indicate a lure for 'free game hacks' and a fake CAPTCHA, suggesting an attempt to trick users into visiting these malicious links. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious redirection workflow, likely leading to a second-stage payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-roblox-codes-2021-march-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/roblox-super-noob-obby-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-devil_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-servers-in-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-aqua-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/download-roblox-robux-hack-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-human-verification-generator_GM431946152.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_off0000523a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523A 26396 bytes
SHA-256: 72935308203bca87ea13cf0e412cd9eb617298283416ee6d9aaa8b597e0492ab
font_01_sfnt_off00008daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAA 19116 bytes
SHA-256: 92dbe0b31b8815bf86a582ec003cae02f7853916c5751017694a4dd9120789b0

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