Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd32ff411527877…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 10:13:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6624c05d0569622068a19814c6d2bdb8 SHA-1: 2896ca02129613f6ca8c0d6154d63abcac752f78 SHA-256: 7bd32ff411527877d029c5a2bc9371dea85af69e58da867637ec3153ae02d2e5
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 0.9632

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.xyz/app/431946152/how-to-get-free-robux-on-pc-game-hack PDF link annotation
    • http://d-cision.nl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/robux-giver_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/legitimate-coin-master-free-spins-apk_GM406889139.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_003_off000048d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D7 24708 bytes
SHA-256: 5df767583579c635f85f0d895b53b5dee1d92c9db62ddf21865456706e6314d8
font_01_sfnt_off000081d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D9 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B88 18436 bytes
SHA-256: 3da4067756d8a9659bbf1d91e8f5987ff560a340f178cc4f41ff3c3676747205

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