Malicious PDF — malware analysis report

Static analysis result for SHA-256 890c3b5a11f66583…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 11:14:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 31c22b24f603b28519fe448690f7359b SHA-1: 171c88f436c8e7112c3cc3f06fd250f43c402c55 SHA-256: 890c3b5a11f66583dd5962ee37e392eb97a5e6ed2993526bdfa4584ccad51a8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links designed to lure users into clicking on them by promising free game currency or hacks. The primary link redirects to malicious infrastructure known for distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful websites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/431946152/can-u-get-free-robux-game-hack In PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BC 25524 bytes
SHA-256: 603c09ff600a31f4e2d1fd0ef9a794be44dd3908dba8b295a34579561d6ffe86
font_01_sfnt_off00008310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8310 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC1 18532 bytes
SHA-256: 35bb0f01f69d1b5e790ed5f4c0eeb98998139975dc1eb58b588dc01b9002bbc1

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