Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ec44b11058fed…

MALICIOUS

PDF

35.6 KB Created: 2021-05-21 00:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 96f85ab2da724b74c8b3d88453539c51 SHA-1: f21a221c87de7bce1e4721ed87fd848776e5f456 SHA-256: 5d8ec44b11058fed6791ca504c9e5c1769172dfe04bf2edf21ff273e2ef55977
300 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, masquerading as game hacks or generators. Heuristics indicate a 'ClickFix' social engineering attack, specifically a fake CAPTCHA designed to trick users into running commands or interacting with malicious links. The primary lure is the "free generator" URL, which is likely the initial step in a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 7

  • 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.
  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/is-minecraft-free-on-pc-game-hack In PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/tiktok-free-zoom_GM835599320.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-link-31-march-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_002_off00003465.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3465 24352 bytes
SHA-256: 39de895e42a6c8d7b936b25aad951e92fb7b95918dea053acf34940801bdb440
font_01_sfnt_off00006bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBF 17724 bytes
SHA-256: 0ab36ec9301b9393cdac417675da6d9cb227c8d57ccc288e3f382d638798bb6c

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