Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa14af3a071079a…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 07:26:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ffbaa743347ce73e57e11381ad5e47aa SHA-1: 7ad77b208988a165fb8f931437ee86ba00994434 SHA-256: 7aa14af3a071079a89ff6d400789329f4c0d83540dbd7f9f9197630a8ee92575
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/best-free-clothes-roblox-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/instant-robux-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-bloxburg-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-an-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-pastebin_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51DA 25084 bytes
SHA-256: 8e5c27db92cdc32dca6c99e7167a66d450a6d3bafafeb11ca74237ef27aac5a7
font_01_sfnt_off00008c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0D 18216 bytes
SHA-256: 61e912fc75c4f335bc2a18b9b67a770066c6ab7bf2fc03b8a880f2720e0c9ae7

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