Malicious PDF — malware analysis report

Static analysis result for SHA-256 addbd8d4be726c83…

MALICIOUS

PDF

43.3 KB Created: 2021-05-13 09:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bf2741b1ea0873830af40db34e97d03f SHA-1: dd22f465dd289dffd2f1159c17c5b0d3cf000bbc SHA-256: addbd8d4be726c83012a394b99564baa84a35e88d72170dbe7984c010979d954
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector. The document body and heuristics indicate a lure for game hacks and free in-game items, a common tactic for phishing or malware distribution. The presence of numerous PDF links suggests a link farm designed to attract traffic and potentially distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/coin-master-free-link-facebook-game-hack In PDF document text
    • https://www.apartmanychorvatsko24.cz/images/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-verification_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-game_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-free-spins-and-coins_GM406889139.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
stream_003_off000045cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45CC 24588 bytes
SHA-256: f96025fabc6b1ed96ddfa83e4f6209c4a7c0022bc2a130670e9657261371b5bf
font_01_sfnt_off00007d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000872e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872E 18040 bytes
SHA-256: 63f6a73c8fcac7a0296ba30c45c7d116406f1db46acc5b5307ffbf1c764f0ccd

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