Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1351e9cba9b4029…

MALICIOUS

PDF

45.7 KB Created: 2021-06-08 18:31:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1156def2812e8b3ff91e7c6602539d97 SHA-1: ac29c1c2547a9be4b58add5365060cc6bef87928 SHA-256: d1351e9cba9b4029f9b074e8d1b72504a455be18b1a8422d0267fdb0e921cbd6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed to lure users into clicking links that lead to malicious redirectors and a link farm, likely for phishing or malware distribution. The document contains multiple links to sites offering 'free generators' or 'game hacks', which are common pretexts for malicious activity. The presence of a malicious redirector and a large number of external links strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-roblox-account-2021-game-hack In PDF document text
    • http://algierimasonry.com/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-do-you-install-minecraft-for-free_GM479516143.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-ios_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/easy-robux-generator_GM431946152.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_004_off00004eed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EED 27488 bytes
SHA-256: 985e9cf76e961922c1fc88f62f4b752e542219be368f629259945c3231057cb3
font_01_sfnt_off00008efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFB 18596 bytes
SHA-256: f4586044dd7d60f822c6ed7ea6fa4c6f107cf73638fc19637292b43d67deb95e

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