Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6436a2a614805cd…

MALICIOUS

PDF

35.4 KB Created: 2021-06-30 02:20:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6ed96c7f81d3f0724ef5618a54587c86 SHA-1: 89af836909ba9282e139e0100e7ffd16f65ab30a SHA-256: d6436a2a614805cdcb876019636fd630322dbc5b49c81615ead6d8dc0c0b58de
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free Robux and game hacks to entice users to click on embedded links. The primary link directs to a known malicious redirector infrastructure, which in turn leads to a large number of other PDF documents hosted on a seemingly legitimate repository, likely part of an SEO link farm. The document's content and structure strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-202120212021202120212021202120212021202120212021-robux-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-headphones-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-download-roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/email-scammer-claiming-to-be-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-cards-no-scam_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-redeem-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-on-roblox-ios_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pokemon-go-free-2021_GM1094591345.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-on-phone-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/info-de-jon-due-el-hacker-de-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-adopt-me-cheats-to-get-a-neon-unicorn_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-gift-card-20210-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-codes-june-2021_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
font_00_sfnt_off000032ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FF 22464 bytes
SHA-256: d98b63740ea561ad03f810b332c18b36a1a0f67a0f4575999e30637a57025f10
font_01_sfnt_off00006538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 19116 bytes
SHA-256: af14d1fa5b4f919e14fbfd2207fee29f86c7e1258ad11836ead4aea48baef512

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