Malicious PDF — malware analysis report

Static analysis result for SHA-256 993db9c76b5fed05…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 15:59:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1c30e9bf97bdc74340312721d9dcf1d2 SHA-1: 4c22b3e132ea864f839f7e9b7a06601d6715553b SHA-256: 993db9c76b5fed05dccda40f4cc989b350a46c38ebed8824d743a8c39a2950b6
180 Risk Score

Malware Insights

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

The PDF document contains multiple links and embedded URLs that lead to a known malicious redirector and IP addresses hosting further malicious PDFs. The lures are related to game hacks and free items, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links suggests an attempt to download and execute a second-stage payload.

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.
  • 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.
  • 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/roblox-parkour-hack-june-2021-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-in-roblox-hoops_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/free-duolingo-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/20210-robux-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/5-roblox-games-that-give-free-robux-working-youtubeyoutube_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-u-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-phantom-forces-cheat-1-milion-credit_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-slash-roblox-id_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-prison-life-on-chromebook_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-bloxburgh-hacks_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-codes-2021-april_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/script-free-robux-2021-no-fake_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_off0000316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316D 22532 bytes
SHA-256: 68c104f28d6d3540675041b9ac51e7d24e6e3881a7a682933319aea72133421f
font_01_sfnt_off000063b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 19520 bytes
SHA-256: ac225a4c587d0f26524fd7dba5298bb4cd9f4346d2899c228389bbc67ce64cdd

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