Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b6eb23d97af45…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 18:41:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44ae6f066b085d8e3ee41e363f1439f6 SHA-1: deda77f0725835f603eb7bdc0e2188c3e9e138bf SHA-256: ab0b6eb23d97af4560642e4f521523506b55e5a311631bf53bec1e4e3e455655
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9864

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/479516143/minecraft-pocket-edition-free-apk-game-hack.
  • 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.online/app/479516143/minecraft-pocket-edition-free-apk-game-hack PDF link annotation
    • http://jarviskeller.co.uk/media/storage/editor/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/robux-money_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/pokemon-go-for-free_GM1094591345.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-com_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
stream_004_off000054b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B1 26060 bytes
SHA-256: 025ccc48ef3db7145b0756084b0f1dc7af8c684cb762e2c797b0bf1c7dbb5f7a
font_01_sfnt_off0000901b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 18384 bytes
SHA-256: d3d1d430428c73896de9795e5eeef6e82810e36860bb7f8fcd97e9577ce89645

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