Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c511ce8b5301281…

MALICIOUS

PDF

31.7 KB Created: 2021-07-06 08:20:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4e07b2d3066d8c24be1d44263f1fdc99 SHA-1: 1d535674a26591c3baa4f9fdb5a539debe87bcc7 SHA-256: 9c511ce8b53012816941f1edac8981684d1a49e445997c683cc0dd7f7a5912c9
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm, designed to lure users with promises of free game hacks and generators. Several heuristics indicate that these links lead to known malicious redirectors or IP addresses hosting further PDF lures. The document body, though partially corrupted, contains URLs that reinforce this lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://netcdn.tw/app/479516143/minecraft-ps4-free-game-hack In PDF document text
    • http://183.91.70.7//repository/how-to-get-robux-easy_GM431946152.pdfPDF link annotation
    • http://183.91.70.7//repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://183.91.70.7//repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/hack-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://183.91.70.7/repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/minecraft-free-ios-no-verification_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
font_00_sfnt_off00002e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9B 21804 bytes
SHA-256: a5c922d623356bdc31b5ebbf003e26fcf32f04354ad3763e227db57aa8b6b539
font_01_sfnt_off00005e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6C 18072 bytes
SHA-256: 07bff6b201fefb5b79bda7bcb703d65895bb3fadc7074254717ea8518f49b268

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