Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb714b7d9495f52…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 09:33:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 893b2dab5613fec67d5feff1df429f50 SHA-1: 873e9a0f7806a3374339481bcdbf06face3c01ae SHA-256: 8bb714b7d9495f520a4bdb9de9dcbd8798af45cfdeac00355feeea9091b61b49
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, suggesting a phishing or malware distribution attempt. The document body and heuristics indicate a lure related to game hacks and free currency, aiming to trick users into clicking through to potentially harmful content. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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.
  • 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/link-coin-master-game-hack In PDF document text
    • http://algierimasonry.com/images/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/rape-simulator_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-and-coin-links_GM406889139.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_003_off000049dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 29900 bytes
SHA-256: 58ebd2a7e864bc8a88748ec12a48cc58daf61dbce3e16a7724fcc4a7d4767dba
font_01_sfnt_off00008950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8950 17716 bytes
SHA-256: c6827e16e0be213214ef51fa89eafee05d7599963a4c26d52cf875a9f4fbeadd

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