Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddfb110c837ff0c…

MALICIOUS

PDF

37.1 KB Created: 2021-05-11 05:01:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ea061f52a89527a0ef1e013b1e34a1b6 SHA-1: 17332aa548bf070633c7d23f0b02c22281ab4481 SHA-256: dddfb110c837ff0c67c53bdadb788daefea3f0ae329b412fb559fa5d48c4173d
170 Risk Score

Malware Insights

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

The PDF file contains a malicious link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The heuristic firings indicate a redirector link and a fake CAPTCHA, suggesting the user is intended to click the link to initiate a download or further malicious action. The document body, though partially corrupted, contains text related to 'Coin Master' and a generator, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • 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/406889139/100-free-spins-coin-master-2021-game-hack In 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_003_off000035ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35BA 25084 bytes
SHA-256: d9be3b8fc5f13f69349a3ab6e548f95df7c3119e2b3fc9415fb1d0b2ae04c540
font_01_sfnt_off00006fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC6 18288 bytes
SHA-256: 1939309b77caa829624372287fe10a2616c3651aa75093da2eb3072b6f3a4d5c

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