Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d81cea27f055e2f…

MALICIOUS

PDF

47.4 KB Created: 2021-06-08 22:55:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ec53cc94e3850e136f6ca714f15044a0 SHA-1: 2dbd3771cb62a866f1c1d2dbc43210d15494a24f SHA-256: 5d81cea27f055e2f9e748777d9f462607e706314b0fa5806965d214251666fa0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users into clicking on what appear to be free generators or game hacks. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of numerous links and the use of a redirector suggest an effort to drive traffic to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/promo-codes-for-free-stuff-on-roblox-game-hack In PDF document text
    • http://zercalo.org/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/no-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F85 25724 bytes
SHA-256: 6dd0f2a30c02c54dc4ffb64ac020d3e95b82dad706f25ce9faad85aae5385056
font_01_sfnt_off00008af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 2968 bytes
SHA-256: 2073ddddd3df21b56468b78a453e8f739667b87ff83dbc50fcad4855f23f7934
font_02_sfnt_off00009530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9530 18780 bytes
SHA-256: 367375c62ca5d9e6eac780096266f5a3b90ac19de52b29169b72cafbedf5243d

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