Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ba3fe3f323fff1…

MALICIOUS

PDF

47.2 KB Created: 2021-06-14 01:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6cf1880f59542e84e6badcddd84d0406 SHA-1: 57ee7d6cde7a76e17dd33aee477c660f4827d73b SHA-256: c5ba3fe3f323fff1608e6da3cc30f8823c422d27ee0caf562411c4830a291a2f
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 0.8948

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 http://netcdn.co/app/431946152/https-bloxy-site-free-robux-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-a-free-dominus-hat-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/jailbreak-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-hack-youtube-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-no-survey-ios_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-2021-v3rmillion_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-speed-hack-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-shirt-not-model_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-raps-for-outo-rap-batils-for-roblox-list_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_003_off00004955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4955 24992 bytes
SHA-256: 521cd6ae99291e88e8f4069f5ab95da4326f8fc16379f50e613ef49c6fbac2af
font_01_sfnt_off000083a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A7 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off00009517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9517 18668 bytes
SHA-256: ce253e2538d1b6014f835f1368407a67fdf69b625e3591aeb42a693982492a42

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