Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d79e592643be9b…

MALICIOUS

PDF

48.0 KB Created: 2021-06-07 08:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a95b954bfc9839881babbd703612c57 SHA-1: c69cd6b3706d3f458b4b85147a669c1595af1e9f SHA-256: 45d79e592643be9b3349f7bc2e1ec5818b8eda525b030e82754eac31a4ab1f29
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-fashion-famous-download-free-game-hack PDF link annotation
    • http://jobsy.com.sg/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/robux-download_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/roblox-free-trial-no-download_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://jobsy.com.sg/images/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://jobsy.com.sg/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/pubg-50-uc-free_GM1330123889.pdfIn PDF document text
    • http://jobsy.com.sg/images/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://jobsy.com.sg/images/minecraft-windows-10-hack-client-2021_GM479516143.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_off0000533d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533D 24428 bytes
SHA-256: a97b0018ad802d9775700565b63a5b7d57d9559fdb309cf19932905351e5999e
font_01_sfnt_off00008b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8C 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off000095b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B7 19368 bytes
SHA-256: cc623969814127db4406efb49ac0718a180d39b235374ae5fb2358eb85b49f30

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