Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15ea1c20d183654…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 19:12:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bcf53a0dc1fcc7f2550d17be5ac808e1 SHA-1: 25af8cc51c39d56b2d985ac21945d82ac9cf2f59 SHA-256: a15ea1c20d18365422f54236794f3bb34ad61308774432e18d83aaa3f5733490
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a "game hack" or "free generator" site. The primary URL leads to a redirector that hosts a link farm of 28 other PDF documents, suggesting a coordinated effort to distribute malicious content or drive traffic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leveraging social engineering tactics to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/coin-master-link-for-spins-game-hack In PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/pokemon-go-free-hack_GM1094591345.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/youtube-how-to-get-free-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
stream_004_off00004e97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E97 25568 bytes
SHA-256: fe31edd336737d58b575651dcf26b7e200b623027c8cc08e4100f01e59bc2dee
font_01_sfnt_off000088ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AD 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9298 18056 bytes
SHA-256: 95118de0f1fa2d9d8d6d34d7ce9f6e9c56d43c25fce4d2a4bd556d275959b9e0

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