Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8f07bfb8a111ad…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 23:25:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4f07675dfb9c946b5251982cde286aeb SHA-1: 8c7541957777d2dfec94f27be9b8d994fef99689 SHA-256: 0c8f07bfb8a111ad1c24b4062733bed4ab1e51d4e8cd94a3532fae82d0033280
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a primary redirector at 'https://netcdn.online/app/406889139/coinmaster-blogspot-game-hack'. The heuristics indicate this is a lure for game hacks and a known malicious redirector. The document body, though heavily obfuscated, contains references to 'Coinmaster' and 'game hack', reinforcing the lure. The presence of embedded URLs and the overall structure suggest an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/coinmaster-blogspot-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-group-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_off00004ed3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED3 25424 bytes
SHA-256: dc0dfc892b462c7c6c45ee2830231f361ea488ad44fbddf280700bf2e167236e
font_01_sfnt_off000089ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89ED 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000093d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D8 18560 bytes
SHA-256: b6c1a4b4a396e514168379159069ddcbbdb2f4734aa5f4f24f50e1de42ff982a

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