Malicious PDF — malware analysis report

Static analysis result for SHA-256 628cbd5af882da0c…

MALICIOUS

PDF

49.7 KB Created: 2021-06-03 09:59:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 318838da6bf637d6029a64010c08bf1b SHA-1: af3172ccc090d856a17e03e8b809056f608ca08e SHA-256: 628cbd5af882da0c30a304f635c95b8419de4c4e31b7e56ac574df82ac1c6d07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links, including one identified as a malicious redirector leading to game hack lures. The document body and extracted URLs suggest a social engineering attempt to trick users into downloading potentially unwanted or malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.
  • 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/431946152/roblox-cheat-engine-fly-hack-game-hack In PDF document text
    • http://www.flytec.com.py/download/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/robux-game-com_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/what-tiktok-free-likes_GM835599320.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/hack-a-game_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 27528 bytes
SHA-256: 0987192492683515fa25b48e70f1ade3f5ccfa78152eb57764c821b3ec0837a3
font_01_sfnt_off00008fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 19204 bytes
SHA-256: 1d8066ef9b893d0873a99f08f219fd8ef841a274efa68177494b807a48e9018a

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