Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a27ac189bb885d6…

MALICIOUS

PDF

44.4 KB Created: 2021-05-11 13:38:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 948012d97bded8c699fa4aa0f4514edf SHA-1: 6ab0d213c2399e3b7020a7997100254499702845 SHA-256: 8a27ac189bb885d67a0eac052d0b79a427ecad940bd32b37a1bef3fa8a7e5f9c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure for free in-game currency, which is a common tactic for phishing or malware distribution. The presence of multiple URLs pointing to similar content, combined with a high ML classifier score, indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • 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/how-to-get-free-coins-on-coin-master-hack-game-hack In PDF document text
    • http://safetin.ru/images/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://safetin.ru/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://safetin.ru/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://safetin.ru/images/how-to-get-more-robux_GM431946152.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_off00004b20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B20 23960 bytes
SHA-256: ac6b68b8ca3ec99ac931920ae15f5e359b5acf1a7894cc91eb62a977da8a0b2b
font_01_sfnt_off000081ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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