Malicious PDF — malware analysis report

Static analysis result for SHA-256 51516aaf761164d2…

MALICIOUS

PDF

37.3 KB Created: 2021-06-26 22:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bda9742bc60599518ec42cb2241986b3 SHA-1: 298b6b9bb8b31f6ad867f1f1dfed832f80957c1f SHA-256: 51516aaf761164d29521cb0cbf3fee60b2741fc65e851b37808041c53aad8781
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that point to known malicious redirectors and potentially malicious content, such as game hacks and cheats. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. The document body, though partially corrupted, also contains similar URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://netcdn.co/app/431946152/redeem-code-free-roblox-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/fearless-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/infinte-moneuz-roblox-injector-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/crack-x-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-online_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/pubg-uc-discount_GM1330123889.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-online-hack-for-free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-100-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A94 22500 bytes
SHA-256: 57bead6a73141d59ba5c3f47a06c2a62427cda3f580b066b0929326bba1dc9fd
font_01_sfnt_off00006cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 19084 bytes
SHA-256: 2a587945e72c9745a662ecac3b279c78f228c9698ef6b8dfdd8f8cfee17a582d

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