Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b6aefe778d94c4…

MALICIOUS

PDF

35.9 KB Created: 2021-05-21 18:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0afef1f862c381603a854b32e7969aaf SHA-1: 09ac32c132399e6bb6a205e9d3d7542c8cf8adcb SHA-256: 61b6aefe778d94c4d625b7f07005162ea527aebbea26f17f7bddc506c1eab161
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple links to known malicious redirectors, disguised as offers for game hacks and premium accounts. It also employs social engineering tactics, instructing the user to execute commands, which is a common lure for ClickFix attacks. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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.
  • 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
  • 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/free-minecraft-premium-account-game-hack In PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/rbx-hut_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-realistic-minecraft-texture-packs_GM479516143.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_off000033b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B4 24488 bytes
SHA-256: fd0deea93af3ae0ee5308d386caeca2a1341eb437ba89bed459675f009479f35
font_01_sfnt_off00006b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4E 18264 bytes
SHA-256: d2b91c2a6de84c5c57e6f7a8c0463896f89b33dea675ffd93dbde2c8d35c79e1

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