Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0c233c4916eb9d…

MALICIOUS

PDF

35.9 KB Created: 2021-06-09 17:28:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af4c585beaf811f85a225bb78b9bd164 SHA-1: 765cf50848d18839b292b537caf6f1e25fdd4587 SHA-256: 3a0c233c4916eb9dcffd07bd54d3c00512a996739b154312c83093e2f73e59c0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links that redirect to known malicious infrastructure, specifically promoting 'free generators' or 'game hacks' to lure victims. One of the embedded URLs uses an IP address, indicating an attempt to obscure the destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • 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/free-t-shirt-deacls-roblox-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-android-2021_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-robux-for-fre_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-catalog-hack-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-robux-credit-card-free-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pastebincom-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/find-roblox-on-computer-hack-in-escape-from-the-demon_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pokemon-go-free-lures_GM1094591345.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005418.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5418 28307 bytes
SHA-256: b11b25717b00217cee0cb6a53dd33e35778683fdc4d6655d0d2985a590ac6650

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